Rengar Build Guide by Palenozord

Changelog

27/09/2012 - Implemented hidden passive of bonetooth necklace, added an trick to his passive skill breakdown, updated skill breakdown section, added skill sequences section, also changed leap to pounce to avoid confusion since Kha'Zix has ability called Leap

02/09/2012 - reformated runes and summoner spells, finally guide starts to look decent, need graphical tweaks though

01/09/2012 - visual tweaks, reformated masteries and abilities, also voting now require comment, due to trolls and no feedback ;(

31/08/2012 - added bruiser and AP sections

28/08/2012 - added playstyle sections and few tweaks, also found out that since release this guide was marked as "build only" despite amount of information in it and wasn't visible in Rengar Guides-im an idiot >.<

27/08/2012 - Completed itemization section

26/08/2012 - Added itemization section for laning

25/08/2012 - Complete guide overhaul, no longer focusing on roaming alone, tweaks to visuals for better reading

24/08/2012 - Guide creation in progress, adding informations and making tweaks over all sections, for better visuals, adding new content

Introduction

Rengar

Rengar

Few words about Rengar himself

Rengar is a big, fluffy kitty, with braided hair and knack for homemade jewelry. He also has unusual hobby of collecting teeth. Oh, and those teeth were ripped them from his enemies corpses, now he wears them as a necklace. Just as his smaller feline cousins loves to jump on all sort of things, he also enjoys it, though Rengar prefers fragile frames of lesser creatures such as raccoons, yordles and carries over furniture.

Whenever you you draw sadistic pleasure from stalking unaware champions, laughing as they pointlessly struggle to run away, or brutally tear them apart before they even realize whats going on, or maybe driving them paranoid with lethal game of cat and mouse, You will love playing Rengar.

spaace

Pros + // Manaless + // Tremendous burst since lvl 1 + // Amazing map control + // Extremally potent with bush usage + // Snowballs easily + // Incredibly fun to play

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Cons - // Get's focused in teamfights - // No hard CC - // May be countered easily

Rune setup

Runes
Greater Quintessence of Movement Speed 3	Greater Quintessence of Armor Penetration 3	Greater Quintessence of Attack Damage 3	Greater Quintessence of Ability Power 3

Runes
Greater Mark of Attack Speed 9	Greater Mark of Armor Penetration 9	Greater Mark of Attack Damage 9	Greater Mark of Ability Power 9

Runes
Greater Seal of Armor 9	Greater Seal of Scaling Health 9	Greater Seal of Ability Power 9

Runes
Greater Glyph of Magic Resist 9	Greater Glyph of Scaling Magic Resist 9	Greater Glyph of Cooldown Reduction 9	Greater Glyph of Ability Power 9

Masteries

Masteries
1/1	3/4	4/4	3/3	1/1	3/3	2/3	2/4	4/3	3/3	1/2	3/1

Spoiler: Click to view

OFFENSE TREE

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Tier 1 // Summoner's Wrath For improved Ghost/ Ignite/ Exhaust, 3/3 Brute Force bonus Attack Damage for easier last hitting and burst potential early Tier 2 // 4/4 Alacrity bonus Attack Speed, not the best stat but works as a filler to next Tier Tier 3 // 4/4 Deadliness additional source of bonus AD improving with lvl, Weapon Expertise makes enemy Armor slightly less effective Tier 4 // 2/3 Vampirism optional feel free to distribute those points elsewhere

DEFENSE TREE

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Tier 1 // Resistance // Hardiness Distribute points here as you like, i prefer having them equall for more balanced stats Tier 2 // Durability Very solid HP gain especially noticeable during mid game, Vigor Bonus regeneration works terrific on roamers as you will get back a lot HP moving between lanes Tier 3 // Veteran's Scars Absolutely must have for lvl1 ganks, those 30HPs are life savers don' underestimate them! Tier 4 // Initiator I personally love this mastery, with this and runes you will get around 400 movement speed with Boots of Speed alone!

Masteries

3/4

2/2

4/4

4/3

1/1

3/3

3/1

1/4

1/1

1/4

2/2

4/3

1/2

Spoiler: Click to view

OFFENSE TREE

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Tier 1 // 3/3 Brute Force bonus Attack Damage for faster camps clearing and burst potential early, 2/2 Butcher for faster clear time Tier 2 // 4/4 Alacrity bonus Attack Speed, works pretty well in jungle Tier 3 // 4/4 Deadliness additional source of bonus AD improving with lvl, Weapon Expertise makes enemy Armor slightly less effective Tier 4 // 3/3 Vampirism additional sustain Tier 5 // 3/3 Sunder Armor Penetration allows to deal higher damage to both champions and minions/neutrls Tier 6 // Executioner Big damage output increase on low HP targets

DEFENSE TREE

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Tier 1 // Summoner's Resolve improved Smite gives pretty nice bonus gold especially useful early, 1/3 Hardiness filler also decrease damage taken from neutrals slightly, tough sking on first levels Rengar has sustain problems this help a lot Tier 2 // Durability Very solid HP gain especially noticeable during mid game Tier 3 // Veteran's Scars Absolutely must have for early game ganks, those 30HPs are life savers don' underestimate them!

Masteries
1/1	3/4	4/4	1/1	3/3	3/4	4/3	3/3	1/2	3/1	3/3	1/3

Spoiler: Click to view

OFFENSE TREE

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Tier 1 // Summoner's Wrath For improved Ghost/ Ignite/ Exhaust, 3/3 Brute Force bonus Attack Damage for easier last hitting and burst potential early Tier 2 // 4/4 Sorcery bonus Cooldown Reduction is awesome stat and we're stacking it, Demolitionist is optional

DEFENSE TREE

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Tier 1 // Resistance // Hardiness Additional tankiness since level 1 Tier 2 // Durability Very solid HP gain especially noticeable during mid game, Vigor Bonus regeneration will increase your sustain greatly Tier 3 // Veteran's Scars Additional 30 HP comes in very handy during early game, must have Tier 4 // Initiator I personally love this mastery, with this and runes you will get around 400 movement speed with Boots of Speed alone! Enlightenment CDR boost for better sustain, damage and CC Tier 6 // Juggernaut Bonus HP scales well into late game, and CC reduction is always great

Summoner Spells

Ignite Works wonders over whole game adds up even more burst to your arsenal, as well as shutting down victim regeneration. As Rengar you will hunt down fleeing enemies a lot, sometimes all you have to do is to throw Ignite from save distance and watch them burn.

Exhaust Versatile, amazing spell for any champion. Can be used both offensively and defensively, adds some nasty CC effect at your disposal. It's great over whole game duration allowing you to stick to your target like glue, shut down enemy damage output and scraps away they mobility. Using this spell, you can also catch up to or escape from enemies to obtain kills or saves other allies, including yourself.

Flash This spell is so versatile it hurts, as Rengar lacks escaping tool fits him perfectly. It as countless usage options. Be it offensive or defense it's one of the most powerful Summoner Spell on any champion. Use it for gap closing, tower diving, flash through walls, get out of sticky situations. Usage options of this spell are countlessUsing this ability WILL NOT break your stealth!

Ghost Extra mobility always comes in handy, with Ghost you will be able to outrun any champion. Whenever it's life threatening situation, you're out of position when your team started big fight or you have problems with enemy getting away, just pop your Ghost and say goodbye to all these problems. In addition it provides you much more mobility than flash when you're able to use your passives' Pounce. Using this ability WILL NOT break your stealth!

Smite This is obviously a must pick for junglers. Not only it helps you jungle faster than you could with any other spell, it also grants you amazing buff controls. I can't even stress how important Smite is. While some champions can get away with jungling without it, Rengar can not, period.

Teleport Teleport gives simply amazing map control. Teleporting on wards and other invisible/hidden objects allows you to gank very effectively. With this spell you can push or defend wherever it's needed. Also works great when backdooring(although i usually don't approve it), simply put ward inside enemy base and teleport to it when they are away. Rengar is amazing demolitionist, and you will be able to cause great havoc in enemy base.

Heal Heal is very strong right now very overlooked. During Early Game it's probably the strongest spell, lets you top almost anyone in 1vs1 fight, escape ganks and provides amazing lane control. Coupled with empowered Battle Roar it gives huge heal at your disposal. Might save you and/or your teammates. It's also good to bait enemies into towers.

Cleanse Rengar is allergic to CrowdControl, this spell solves the problem and is simply amazing. However it's advanced spell, requiring very short reaction time and is very hard to use to full potential. You want to remove CC in instant it landed on you but at the same time you need to factor in a lot of different things, less experienced players should drop it in favor of other spell.

Clairvoyence Woot?! Clairvoyance! Even though next to noone uses this spell anymore(at least in normal games/my elo range), it's still strong team oriented spell. It gives your team free map awareness and let's you track your enemy's jungler. Protect people from ganks, let's your team move as a group without stumbling into a trap. But why would anyone pick it on Rengar? Aside from pointers above, to take advantage of his passive obviously, it really allows you to perform some amazing tricks while running through the jungle, it's quite fun. It's here only because it deserved to be mentioned.

Skill Breakdown

Unseen Predator (Passive)

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His innate consists of two parts: Ferocity once you get used to his resource bar you will love it. You want to spam abilities whenever possible to build it as fast as possible. Your Ferocity enhanced abilities got no cooldown and available to use as soon as you reach 5 bars. Pounce in my opinion one of the best passives in game, makes Rengar terrifc ganker/assasin. It's amazing for chasing, initiating, kiting or simply running away. Mastering it will separate great from decent players. Cooldown: none Range: 600/750(with 9 stacks on Bonetooth Necklace

• It fades off after 0.5sec after leaving bush, if you move fast enough you will be able to Pounce into dragon or baron through walls
• During teamfights try to utilize it to dodge skill-shots and kite those annoying bruisers by Pouncing around
• Ward or have your team ward jungle, ability to leap between neutrals camp will improve your juking and chasing potential greatly
• When Pouncing out of stealth provided by Thrill of the Hunt you can Pounce twice if u click fast enough, this allows you to cover pretty large distance when chasing/running away

Savagery Q

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Cooldown: 6 seconds Damage: 30 / 55 / 80 / 105 / 130 (+100% of Attack Damage) Attack Speed Bonus: 30 / 35 / 40 / 45 / 50 % Range: melee Ferocity Empowerment: additional +150% Attack Damage and +100% Attack Speed bonus

Savagery

Savagery

Savagery

• Bonus Attack Speed from Savagery and its empowered version stacks up to 150%, increasing his burst even further
• Usage of this ability resets your auto-attack timer, use to your advantage in small skirmishes by timing your combo immediately after landing auto-attack
• Activating this ability won't break stealth from Rengar ultimate
• You can surprise enemies while on low HP by luring them in once you have 4 Ferocity bars and burst them down from 70% withing split second

Battle Roar W

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Cooldown: 15 / 14 / 13 / 12 / 11 seconds Magic Damage: 75 / 120 / 165 / 210 / 255 (+1.0 per ability power) Bonus Armor & Magic Resist: 20 / 30 / 40 / 50 / 60 for 3 seconds Range: 400 Ferocity Empowerment: In addition will heal Rengar for 15% of total HP

Battle Roar

Rengar

• Try to save it to shrug off initial burst in teamfights
• Heal from Empowered Battle Roar will work even if you don't hit any enemies with it
• Using Battle Roar and Empowered version works great in jungle provides great sustain as well as fast clear time, use it after 3sec because resistances doesn't stack
• Try to maintain bonus resistances when using it's empowered version, they won't stack so use it in intervals to prolong they duration

Bola Strike E

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Cooldown: 12 / 11 / 10 / 9 / 8 seconds Physical Damage: 60 / 105 / 150 / 195 / 240 (+0.7 per bonus attack damage) Slow: 50 / 55 / 60 / 65 / 70 % Range: 575 Ferocity Empowerment: Will immobilize target for 1 second and apply slow for remaining 1,5 seconds

Bola Strike

Savagery

Battle Roar

Bola Strike

• It's devastating during ganks, immoblize+heavy slow over 5sec should be more than enough to secure most kills
• Don't use it for sheer damage alone, it's slow component is too great to waste
• Builds Ferocity while kiting, this may allow to punish overextending chasers

Thrill of the Hunt R

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Cooldown: 120 / 85 / 50 seconds Movement Speed Bonus: 10 / 15 / 20 % Reveal Range: 2000 / 3000 / 4000 Stealth Duration: 7 seconds (10 seconds with 14 stacks on Bonetooth Necklace)

• Using items or abilities such as Youmuu's Ghostblade, Savagery and Ghost/ Flash won't break stealth, this allows you to attain huge mobilty bonus(other items and summoner spells require further testing)
• Use it's reveal component to setup ganks and catch lone champions
• This ultimate is great escape mechanism, it has 2sec fade time though so requires some timing to be effective
• During teamfights use it to bypass hostile tanks and bruisers to assassinate squishes
• If you use it to reveal enemy stealthers remember attacking them will interrupt reveal

Skill Sequences

If you play wizard Rengar feel free to skip this section, you always want to max W first, hope it saved your time.

There is an ongoing debate on which ability should be maxed first, this guide will not tell you which one is superior. Each of Rengar abilities is viable, each have good damage, each is unique and each serves different purpose. Im not gonna tell you that you should level-up the same ability in every game, i want to encourage you to try to find your own mix. Just as you buy items to counter enemies, exploit their weaknesses or take advantage of your strong points, you should carefully consider which ability will give you the biggest advantage after each level-up.

There are many different factors which should be considered in every game, thus im not able to cover every possible scenario. I can however, lay the basics.

Obviously you want to level up your Ultimate whenever possible, higher movement speed bonus, wider range of it's reveal component and shorter CD are all invaluable. You want use it as often as possible.

Deciding which ability to level up is tricky, but after a bit of experience with Rengar you should know pretty well what will benefit you the most. Generaly You want to level:

Savagery when: -snowballing, it's perfect option to secure your dominance after succesful early game -facing easy lane opponent such as Nasus -you need heavy burst and can rely on your teammates CC -you want more pushing power sp sp sp sp sp sp

SPACE

Battle Roar when: -facing opponent(s) with heavy harass and/or armor(i.e. Darius) -enemy has some way to neglect your physical burst -you need to be tanky during team fights -you want to mitigate heavy burst champions sp sp sp sp sp

SPACE

Bola Strike when: -your jungler got high damage but lacks hard CC/gap closer(i.e. Shyvana) -your team is low on CC -you will need to peel off enemies training your squishes -you need some way to secure kills due to enemies having high mobility -youre jungler/roamer and beign concerned about CC more than DMG sp

Rengar

Itemization - Bonetooth Necklace

This item deserves individual section


Bonetooth Necklace is Rengar exclusive item, its incredibly cost-effective and fits very well into his hunter theme. Also turns our feline pupil into badass tooth fairy who not only pulls teeth straight from kidschampions mouths but steal their money as well!
For 800gold we receive:
10(+2 per level) Attack Damage totaling 46 AD at level 18. That's right 1AD more than B. F. Sword for less than half of it's price! On top of that it's will give you significant boost after successful hunting:

• 3 trophies will provide you with additional 5% Cooldown Reduction and 10 Armor Penetration
• 6 trophies result in 25 bonus FLAT movement speed, as long as you can manage those stacks this makes Rengar one of the fastest champions in game.
• 9 trophies increase Pounce distance from your passive by 150, this open whole new spectrum of creative plays while prowling in the jungle.
• 14 trophies is your ultimate goal, it offers buff to your Thrill of the Hunt increasing it's duration up to 10 seconds and causing your next ability to generate additional Ferocity

Bonetooth Necklace

Bonetooth Necklace

Kha'Zix

Rengar

Bonetooth Necklace

Rengar

Bonetooth Necklace

Itemization

Riven

Pantheon

Item Sequence
Boots of Speed 350	Health Potion 35	Health Potion 35	Health Potion 35	Boots of Mobility 1000	Bonetooth Necklace 800	The Brutalizer 1337	The Bloodthirster 3200
Youmuu's Ghostblade 2700	Maw of Malmortius 3200	Guardian Angel 2600

The Bloodthirster

Spoiler: Click to view

Core item for an assassin Rengar should consists of:

Boots of your preference
Boots of Mobility
Great choice for a roamer, better map control, accelerates ganking thus letting us pile up kills faster. As late game approaches they should be changed to other boots for raw stats.
Mercury's Treads
Hands down the best item when it comes to dealing with CC heavy teams. Tenacity is invaluable over whole game duration, bonus magic resistance is icing on the cake.
Ionian Boots of Lucidity
Cooldown Reduction is one of the best stats available, allowing faster abilities spam, fueling Ferocity, increasing damage output, surviability and utility. With caped CDR Rengar's ultimate has only 30sec cooldown!

The Brutalizer
Simply amazing item for Rengar, 25 Attack Damage is no pushover, additional Cooldown Reduction works wonders and stacking Armor Penetration will make you shred champions into pieces during early/mid game. It also upgrades into Youmuu's Ghostblade

Your core is complete:

Now it's time for BIG items, depending on situation and both team composition you've got few viable options:

Bloodthirster
If you saw other guides this item was in every of them for a reason. Huge AD boost coupled with high Lifesteal is just way too good to pass. If you rush B. F. Sword after core you will turn into killing machine.

Youmuu's Ghostblade
At first I've used this item only for snowballing purposes but now i simply can't imagine Rengar assassin without it. CDR and ArPen works great, and active coupled with your double Savagery combo lets you to reach 2.5 Attack Speed without really investing into it. Count in around 350AD on top of ~50Armor Penetration and enemies will not know what hitted them. It's power peaks when snowballing and bought early(this is an example)
Remember that using Youmuu's Ghostblade active WILL NOT break your stealth!

Trinity Force
Definitely one of the best items for Rengar, bonus Movement Speed, Slow and Damage procs on top of raw stats provided by this item easily place it within best picks for any build. However its very expensive item and some of stats are useless for Rengar, still great item. Start by building Phage, Zeal and Sheen are matter of preference.

Note that you will not always want to build both Trinity Force and Youmuu's Ghostblade sometimes it will be more beneficial to build just one and swap other to counter your enemies. Last item should be picked strictly depending on situation.

Guardian Angel
Overall great defensive item, resistances and passive provided by this items will punish enemies for focusing you. Late game it's revive may turn the tides of a battle or entire game. Don't underestimate it.

Bloodthirster
Picking second The Bloodthirster will give you insane damage. With this you won't have any problems taking down carries and should be able to out-heal bruisers and tank DMG with Lifesteal. Not always offence is the best defense though, get it only when team is low on CC or you simply don't need defensive items.

Maw of Malmortius
One of my favourite items atm, Damage provided by it is huge, magic resist give some nice survivabilty and Magic Damage buffer is life saver. On top of that it's very cost-efficent. It's effectiveness peaks versus heavy Magic Damage teams, getting it against fed AP champion is obvious choice and even if there is none its still solid choice. Start by building Hexdrinker it's passive might save your life.

Last Whisper
Perfect choice when enemy team has some heavily armored lineup, this will help you eat thourh them. However flat Armor Penetration is applied BEFORE percentage Armor Reduction, which makes ArPen stacking undesirable. Also make sure you make use of full potential of your Last Whisper for more details read THIS THREAD it's full of useful info.

Black Cleaver
Haven't tested this one yet, but on paper seems like solid choice. High AD and Armor Penetration are always welcome on Rengar. How ever as an assassin you want to burst enemy down ASAP and with this you have to either lose time stacking it's debuff or wasting a bit of Savagery damage. Will update it after some testing.

Quicksilver Sash
How could i skip this item when writing it earlier? It's simply amazing! As an assassin CC is your main concern, this item will help you work your way around it. In some circumstances it's the best item in the game, both defense and offence -wise. It also provides pretty decent magic resistance.

Frozen Mallet
Grab this if you have trouble surviving fights and sticking to your target. Mallet will boost your survivabiliy greatly and permaslow simply makes your life easier. Obviously start by building Phage

Item Sequence
Boots of Speed 350	Health Potion 35	Health Potion 35	Health Potion 35	Bonetooth Necklace 800	Mercury's Treads 1200	B. F. Sword 1550	Phage 1465
The Bloodthirster 3200	Frozen Mallet 3300	Randuin's Omen 3100	Force of Nature 2610

Spoiler: Click to view

Core item for an Bruiser Rengar should consists of:

Boots of your preference
Mercury's Treads
Hands down the best item when it comes to dealing with CC heavy teams. Tenacity is invaluable over whole game duration, bonus magic resistance is icing on the cake.
Ninja Tabi
When facing strong AD champions these will give significant boost to survivability. Get those when you're concerned about enemy team auto attackers more than casters and they low CC.
Ionian Boots of Lucidity
Cooldown Reduction is one of the best stats available, allowing faster abilities spam, fueling Ferocity, increasing damage output, surviability and utility. With caped CDR Rengar's ultimate has only 30sec cooldown!

Phage
Amazing item for Rengar, especially when gotten early, as your Savagery gives you ton of Attack Speed you don't have to worry about it falling off. Bonus HP lets you stay in fights a bit longer but this item shines during ganks or chasing enemies. It's super effective and most likely you will end up building Frozen Mallet

Heart of Gold
Might help you recover from bad lane, you want to get it ASAP when denied during laning phase. Bonus HP is very efficient on Rengar thank to scaling with Battle Roar and huge resists boost. Also it's component of Randuin's Omen which is probably the best tanking item for Rengar.

Hexdrinker
Perfect choice if you have difficulties facing strong AP champions. Not only give you nice survivabilty but provides some killing power as well. It's cheap, effective and builds into Maw of Malmortius Optional

Wriggle's Lantern
Overall nice package, lets you farm minions like an harvester, raw statistics are pretty decent as well. I would get this versus heavy AD champions and sell it toward end game. Optional

So by the beginning of mid game your item core should look like this:

or
when doing poorly
+consider taking an deffensive item Hexdrinker or Wriggle's Lantern

Mid game kicks in and we are ready to work toward BIG ITEMS. Note that you should always take into consideration which of items listed below will work best against enemy team setup. Your goal is to find ballance between offensive and defensive items.

Frozen Mallet
It's Phage on steroids! Most likely first big item you gonna get. Provides huge boost to your HP pool and with permaslow you can be sure that no one will run away from you.

Bloodthirster
You need heavy attack damage to keep you threat on the battle field and this one has the highest in the game. Sometimes it's good idea to rush this item, if gotten early enough it will allow you to one-shot people during until late-mid game. Lifesteal gives you pretty good sustain as well. Start with B. F. Sword

Trinity Force
Great over all item, but situational for bruiser. Cost is very high, statistics are distributed evenly and while Rengar doesn't benefit from all of them this is still awesome item for him. Movement Speed is essential on every champion, Sheen proc is very noticeable, but Phage component is wholly overwrited by Frozen Mallet You have to chose which will benefit you the most. If you chose Trinity over Mallet you will most likely need additional HP item

Warmog's Armor
Highest HP item in the game, synergises well with Battle Roar. Cost is very high and it provides no resistances nor damage. However might be good idea to build it with items like Atma's Impaler and Force of Nature.

Guardian Angel
This is your late game item, resistances and revive provided by this item will most likely discourage enemies from focusing you.

Maw of Malmortius
If you builded Hexdrinker earlier this is the way to go. Offers high Attack Damage bonus and survivability against Magic Dmg, on top of that when focused passive from it will make you hit like a truck.

Randuin's Omen
For those games when you need some tanking power to shrug fed AD carries this is your best bet, high Armor, solid HP boost, tiny bit of CDR and sweet active/proc will allow you go toe to toe with any AD champion.

Force of Nature
Quite like Randuin's Omen but for countering AP champions. Also have great synergy with high HP items like Warmog's Armor or Frozen Mallet

Atma's Impaler
While bonus critical on this item is kinda meh, it's still very solid choice against heavy AD. atama's impaler gives decent Armor but real strength of this item come from awesome synergy with HP items, allowing bruisers like you gain significant bonus damage without sacrificing survivability.

Im still testing different items for bruiser Rengar. Those are more obvious choices and more will come soon. Ill keep you posted

Item Sequence
Cloth Armor 300	Health Potion 35	Health Potion 35	Health Potion 35	Health Potion 35	Health Potion 35	Madred's Razors 700	Boots of Speed 350
Bonetooth Necklace 800	Ionian Boots of Lucidity 1000	Wriggle's Lantern 1600	Phage 1465	Frozen Mallet 3300	The Black Cleaver 2865	Zeke's Herald 2550

Phage

Spoiler: Click to view

Core item for an Jungler Rengar should consists of:

Boots of your preference
Mercury's Treads
Hands down the best item when it comes to dealing with CC heavy teams. Tenacity is invaluable over whole game duration, bonus magic resistance is icing on the cake.
Boots of Mobility
They give you amazing map control and ganking potential, as a jungler you want to be everywhere and those let you to bypass wards to some extend. Late game they may be changed to other boots for raw stats.
Ninja Tabi
When facing strong AD champions these will give significant boost to survivability. Get those when you're concerned about enemy team auto attackers more than casters and they low CC.
Ionian Boots of Lucidity
Cooldown Reduction is one of the best stats available, allowing faster abilities spam, fueling Ferocity, increasing damage output, surviability and utility. With caped CDR Rengar's ultimate has only 30sec cooldown!

Wriggle's Lantern
While sustain from it is not essential for Rengar, i would get this item in almost every game as a jungler. They speed up your farm greatly without losing of effectiveness in early fights. But the most important factor is Dragon/Baron control, those spots should be warded permanently. Also well placed ward in jungle might help you turn the tables of a fight thx to Unseen Predator Very occasionally you will stop at Madred's Razors and build it later into Madred's Bloodrazor but ill cover that later.

Phage
Amazing item for Rengar, especially when gotten early, as your Savagery gives you ton of Attack Speed you don't have to worry about it falling off. Bonus HP lets you stay in fights a bit longer but this item shines during ganks or chasing enemies. It's super effective and most likely you will end up building Frozen Mallet

Your core:

After those you should focus on filling your team setup composition. Orange is offensive path, Blue defensive and Green is supportive. Note that you will have at least decent damage with every of those builds.

Offensive items will help you when your team is low on physical damage, or carries can't do their job for an reason. Those items will turn you into semi-carry/assassin.

Spoiler: Click to view

Trinity Force
Great over well rounded item, it will give you a bit of everything you need, it's procs will make you very efficient. For offensive use i would build ASAP

Bloodthirster
This is your favorite item. Huge Lifesteal on top of the highest Attack Damage in game. With The Bloodthirster you will be able to wreck burst down squishes in split second and when not CCed will let you take a lot of punishment thank to Lifesteal.

Infinity Edge
There's an ongoing debate how effective it is on Rengar so i will hold with verdict. Huge damage increase with Critical Strike chance and damage boost. Might potentially one-shot people with this and right item setup. However crit isn't the best stat on Rengar due to mechanic on Attack Modifiers and Critical Strike. ATM i'd prefer second The Bloodthirster over it.

Phantom Dancer
When buying an Infinity Edge might as well go down the road of auto-attacker. Bonus Attack Speed and high Critical Chance will result in huge DPS increase. Stacking crit+attack speed will overcome one of fatal flaws of Rengar-falling off dmg during late game, however it will also left you very vulnerable.

Last Whisper
Perfect choice when enemy team has some heavily armored lineup, this will help you eat thourh them. However flat Armor Penetration is applied BEFORE percentage Armor Reduction, which makes ArPen stacking undesirable. Also make sure you make use of full potential of your Last Whisper for more details read THIS THREAD it's full of useful info.

Black Cleaver
Haven't tested this one yet, but on paper seems like solid choice. High AD and Armor Penetration are always welcome on Rengar. For Armor Penetration get this or Last Whisper, however make sure noone else on your team has one already.

Frozen Mallet
When you're having trouble sticking to your target this should fix it. Bonus HP will provide you with a buffer for surviving CC. If you want to grab Frozen Mallet over Trinity Force, consider taking Infinity Edge+ Phantom Dancer

Maw of Malmortius
One of my favourite items atm, Damage provided by it is huge, magic resist give some nice survivabilty and Magic Damage buffer is life saver. On top of that it's very cost-efficent. It's effectiveness peaks versus heavy Magic Damage teams, getting it against fed AP champion might give you upper hand. Start by building Hexdrinker it's passive might save your life.

Madred's Bloodrazor
Very strong choice against HP stacking enemies, also works great versus enemies who skipped Magic Resist. Contrary to common belief Rengar does benefit from Attack Speed and this is viable item or him. If enemy team line up contains champions like Dr. Mundo, Cho'Gath, Olaf, etc. dont upgrade your Madred's Razors and build this later on, trust me it will pay off.

Defensive items should be build when your team lacks an offtank.

Spoiler: Click to view

Frozen Mallet
It's Phage on steroids! Most likely first big item you gonna get. Provides huge boost to your HP pool and with permaslow you can be sure that no one will run away from you.

Warmog's Armor
Highest HP item in the game, synergises well with Battle Roar. Cost is very high and it provides no resistances nor damage. However might be good idea to build it with items like Atma's Impaler and Force of Nature.

Randuin's Omen
For those games when you need some tanking power to shrug fed AD carries this is your best bet, high Armor, solid HP boost, tiny bit of CDR and sweet active/proc will allow you go toe to toe with any AD champion.

Force of Nature
Quite like Randuin's Omen but for countering AP champions. Also have great synergy with high HP items like Warmog's Armor or Frozen Mallet

Atma's Impaler
While bonus critical on this item is kinda meh, it's still very solid choice against heavy AD. atama's impaler gives decent Armor but real strength of this item come from awesome synergy with HP items, allowing bruisers like you gain significant bonus damage without sacrificing survivability.

Thornmail
Anti-AD Carry item, get this only versus fed ones. It will sap your damage and survivability against AP however it might pay of. Situational item.

Word supportive is kinda exaggerated because there are no real support items fitting Rengar beside Zeke's Herald. However i found out it works pretty well and it deserves a mention.

Spoiler: Click to view

Zeke's Herald
Surprisingly good item on Rengar, you and your AD carries will love it. With your Wriggle's Lantern Lifesteal is strongly noticeable, other stats especially CDR works great on him.

Black Cleaver
Shredding enemies Armor will help your team mates shred them. Also gives you decent Attack Damage and Attack Speed. Solid item but make sure noone else going for it.

Sunfire cape
While going this route will not make you the most threatening presence on battle field, you still need some defensive stats to keep you in fights. Sunfire will sate your need for HP and Armor and give that annoying aura to piss of your enemies.

Warmog's Armor
Highest HP item in the game, synergises well with Battle Roar. Cost is kinda discouraging but if you get this you won't need much more defense. Get this if you find yourself dying a lot.

Thronmail
This item is designed to shut down AD Carries, this will punish them hard for focusing you. Its also great for tanking towers and Baron. Get this only when fighting a fed AD carry or high AD team.

Randuin's Omen
Provide very nice survivability but you want it for it's active and passive procs. They give you an additional option to shut down enemy carries from killing your teammates.

Madred's Bloodrazor
When facing high HP enemies or you have heavy AD setup this might will punish enemies for HP stacking/skipping Magic Resistance.

Feel free to experiment with different setups of listed items and find your own mix

Roaming - Playstyle Section

After playing few games as Rengar i was shocked to notice that so many players don't know what is roamer, leave it be how to play one or what his role is. I'll start with some explanations.
So what is Roamer?
Put simply, a Roamer is a high risk high reward hero who, rather than playing in a set lane, roams the map ganking other lanes. They are mostly used as part of ganking strategies to help put early pressure on the other team, although the metagame does not currently favor the practice.

Advantages of A Roamer:

Frees up a second solo lane
Allows you to gank dangerous opponents effectively to help keep them down
Puts pressure on the opposing side, as they can never be entirely sure that they're safe
Greater map and jungle control than most of junglers

Roamers are generally under-leveled and under-farmed
Your second solo may suffer in a 2v1 laning situation
If your Roamer is unsuccessful, you are likely to be at a disadvantage for the remainder of the game
Your team should be built around the Roamer - having a poorly chosen lanes can cause the loss of the game. This makes Roaming in pubs a risky business
You will be called troll, fail jungler, etc.

Rengar ganking potential is tremendous, he able to almost one-shot people at level 1 and he still wins early fights without putting much effort in it.

• Never try to gank without 3 bars of Ferocity(4 are mandatory on lower levels)
• Be pattient, dont just leap out of bushes immediately coordinate with your team mates, let them know you're ready and let them make a setup
• Pay attention to map, constantly look for gank opportunities and be warry of enemies movement(especially junglers!)
• Help your team, buy some wards, report misses cover lanes while team mates go shoping/regen etc.
• Be unpredictable, strike where they expect you the least
• Don't feed, 1 for 1 trades aren't permitted

Level 1 gank

• After purchasing starting items we rush to neutral camp closest to our first target(pick it carefuly considering summoner spells, probable items, masteries, abilities).
• At 1:40 min mark we start stacking Ferocity viaHIT AND RUN as shown in this video.
• Hide in bushes and wait for kill opportunity(Rengar can burst down almost any champion in split second at this point so you can go pretty much rambo)
• Stack Ferocity up to 4 and you're ready for next gank

Early Game

Boots of Speed

Doran's Blade

Battle Roar

Bonetooth Necklace

Long Sword

Ruby Crystal

Laning - Playstyle Section

Early Game

Rengar

Cloth Armor

Health Potion

Riven

Pantheon

Doran's Blade

Boots of Speed

Health Potion

Savagery

Phage

Long Sword

The Brutalizer

Ruby Crystal

Bonetooth Necklace

Ruby Crystal

Phage

Easy

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Akali You easily out-trade her early, be as aggressive as possible. Shes not really a threat to you, at least until lvl 6. Utilize your passive, if possible last hit from bushes and harass with your Q+Pounce combo followed by immediate return to bushes. Your kit counters her in every aspect, mitigate her burst with your Battle Roar, with Savagery + Pounce you can harass from nice distance if she decide to fight back use Battle Roar and proceed to dump your auto-attacks and abilities on her. Avoid fighting in Twilight Shroud and be wary of enemy jungler movements.

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Medium

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Cho'Gath To be honest im yet to play against Cho'Gath once again play aggressively. Cho is squishy early on and his sustain depends on how successful he is with last hitting. Force early engages and you should be able to push him out of lane. Your success depend mostly on how well you dodge his Rupture, therefor Boots of Speed are mandatory. He will start to catch up with every level and since 6 he will be BIG problem(literately) Deny him his farm since level 1 and he won't be much of a threat later.

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Medium

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Darius Darius is one scary champion, many players are scared by his sight alone and make a mistake of playing too defensively. You want to put as much pressure as possible, Darius kit however makes it problematic. His armor gain is among highest(if not THE highest) in game, deals mixed damage and is quite hard to get away from. Max Battle Roar first, your bola/savagery damage are joke to him. On the other hand your double casted W deals sick damage, while buffing your defenses and restoring your health(getting used to its range will take some time but it pays off). You will NEED Boots of Speed. Open on him with 3 ferocity: open with autoattack(prefarably with pounce) followed with Battle Roar then, depending on his reaction: if he back off-punish him with E>W>Q combo/if he decide to fight you, throw Savagery and run away from him most likely you will get pulled by Apprehend, dont panic and throw Bola Strike to shake him off hit him with your empowered Battle Roar to regain lost HP and neglect damage from his passive. If you pulled it off correctly you won your small skirmish and earned yourself few seconds of free harassment as Darius without his pull is a joke, just hit(pounce) and run, spamming skills. DON'T LET HIM STACK HEMORRHAGE or else he will get upper hand. This matchup is all about how well you know your limits and use abilities.

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Jungling - Playstyle Section

Start with Cloth Armor+5 Health Potion unless you go for an early gank, if so get Boots of Speed instead.

Standard route:

Savagery

Savagery

Battle Roar

Madred's Razors

Boots of Speed

Savagery

Bola Strike

Thrill of the Hunt

Rengar

Savagery

Assassin - Playstyle Section

Early game was covered in sections above as they will vary depending on your chosen path: Roaming, Laning or Jungling

Phage

Rengar

Battle Roar

Thrill of the Hunt

Rengar

Alistar

Thrill of the Hunt

Savagery

Youmuu's Ghostblade

Savagery

Rengar

Teemo

Alistar

Bruiser - Playstyle Section

Early game was covered in sections above as they will vary depending on your chosen path: Roaming, Laning or Jungling

Rengar

Savagery

Battle Roar

Bola Strike

Battle Roar

Savagery

Frozen Mallet

B. F. Sword

The Bloodthirster

Thrill of the Hunt

Bola Strike

Battle Roar

Thrill of the Hunt

Wizard - Playstyle Section

I hate to admit it but it does work. It's stupid, skilless and not fun, but i'll be damned it really does work.

Rengar

Sion

Sion

Death's Caress

Rengar

Battle Roar

Battle Roar

Boots of Speed

Health Potion

Ignite

Savagery

Bola Strike

Ionian Boots of Lucidity

Needlessly Large Rod

Battle Roar

Mejai's Soulstealer

Rabadon's Deathcap

Mejai's Soulstealer

Battle Roar

Lich Bane

Void Staff

Hextech Gunblade

Lich Bane

Battle Roar

This build is perfect to ruin you game experience with Rengar. I don't like playing him this way, but it's very easy and effective and should be mentioned.

Rengar Trophy Hall

This section will hopefully be soon filled with Screenshots and Replay links boasting scores achieved by players using this guide

Replays

Spoiler: Click to view

Few first consecutive games as roamer assassin

Summary

Credits/Refs

Special thanks to:
jhoijhoi - for awesome guide tutorial, without it this guide might be as well notepad file
bloofyre - for templates
Lord Drek - for full guide review, granted some nice tips. Check out his Irelia guide aswell

Everyone who contributed creation of this guide, voted, or commented, Your help is very appreciated. Seeing this guide going up from 36% guide rating despite excessive trolling is very rewarding, Thank You all for reading.