Hello!
I'm Zozuh and I'm a Rengar main. I've been playing Rengar for a few years and have pretty much mastered him. He is my favorite champion in the game from his personality to his play style. If you want to one-shot people and get out safely while sounding like a bad ***, this is your champion. This is my first guide, so comments on improvement are really appreciated! As well as your up votes :D
This Guide will be continuously updated until completed.
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Pros: One-Shotting Capabilities Can be Tank + Big Damage Fast Movement Speed Low Cooldowns Midgame Unlimited Bush Jumps Snare and Slow % Damage HP Heal Amazing Snowballer Lethality is pretty good still Cons: Has trouble with big tanks Control wards suck Can be terrible if behind Hard for new players W and E on long cooldowns early game Ferocity management

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You start with this tree as the main one to really bring forward and enhance Rengar's assassin abilities. Each Rune picked from this tree aims to enhance his assassination capabilities and works to increase his damage output.

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This rune amplifies Rengar's combos by a large amount, allowing him to spit out more damage in a short amount of time. As you only need 3 unique attacks to proc this rune's effect, his combo even without a leap will easily allow you deal more damage.

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This rune works very well with your passive and ult, giving you increased killing power after each leap. The lethality just adds to the amount you receive from the build, and is just the best choice out of the ones available.

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This rune enhances your vision control, allowing you to keep vision in your own jungle as well as the enemies. It;s a good choice to tactically put yourself ahead and make good picks for a snowballing game.

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The Ravenous Hunter rune allows you to heal through the early game, and gives you the sustain you need to pull off early fight more efficiently. We take this over relentless hunter because that rune's effect only benefits you out of combat, and with your speed from Ultimate, you don't need that.

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Sorcery is the rune tree we are going with for the secondary option. Since we picked domination as our first tree, Sorcery allows us to start off with an extra 6 AD, making the early clears slightly easier.

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This rune gives us some more fighting power due to it's nice CDR benefits. On top of this, it allows us to stack CDR, enabling us to efficiently use certain items, as well as rewarding us for doing this with MORE AD for each % of CDR.

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This rune ensures that we scale more heavily into the late game, making it slightly easier to win every 10 minutes. For really long games, this definitely turns the tide.

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Passive: Unseen Predator Rengar's passive takes a lot of management. Bonetooth necklace allows him to snowball easier, so make sure you're involved in as many kills as possible. For the first few kills of the game, it's fine to take the kills from lane ganks if the corresponding stack hasn't already been received. After that, feel free to distribute the kills as you see fitting. I personally like to take things into my own hands and take the kills. Unseen predator allows a lot more mobility and a gap closer on a 0 CD. Ferocity is what makes Rengar, Rengar. Being able to properly manage this bar allows you to fully use Rengar's power. It also allows a lot more diversity in gameplay/playstyle. Also remember that your jump range is actually a little further than the indicated line, and you also keep the ability to jump 0.5s after leaving the bush.

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Q: Savagery This is Rengar's main ability. It's high AD scaling, low cooldown and AA resetting feautures means Rengar is always ready for a fight. On 3 stacks of Ferocity, you can Q and then empowered Q instantly for insane damage. Use this ability whenever possible, as it's low Cooldown literally turns it into an auto attack!

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W: Battle Roar This ability is just plain annoying to the enemy team. It's healing means you automatically become more tanky and harder to kill, and the empowered version just means you can barely be touched. It helps you pull off those sick clutches, as well as survive surprise attacks or misplays. A very handy ability overall, and even gives you the option to play the rare AP Rengar.

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E: Bola Strike This is your main tool for ganking. You can ult, then E mid-leap and once you've got your 4 stacks, you can E again for a snare and a guaranteed kill. Even without being empowered, your E's slow mixed with stalkers smite is crazy. I also use bola strike to finish of low enemies that are a distance away, or to slow them down from over the wall for an ally to follow up, or to keep them within distance of leaping range from a bush. Don't be afraid to use this ability for damage, as it scales with 70% of your total AD.

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R: Thrill of the Hunt You can use this this for a lot of different things, such as to catch up to an enemies, gank a lane sneakily by avoiding wards, or to run away from the enemy if you get caught out. You can even use it to jump onto dragon and steal it if need be. At 40% CDR and level 3, your ult cooldown is crazily short, so use it whenever you like! It also counts as a bush of sorts, meaning you generate 1 ferocity from leaping with it.

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Hunters Machete - The basic starting jungling item for Rengar in the jungle, as it gives Rengar more attack speed, and healing form his attacks. This works on his Q which is on a low cooldown compared to his other abilities. This is why we don't take Hunter's Talisman, as Talisman isn't as effective on Rengar due to the long cooldowns early game.

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Stalkers/Skirmishers/Trackers - This upgrade is 100% preference and based fully off playstyle. Stalkers is my personal favourite as it almost guarantees a kill if you for some reason miss your E. Skirmishers is good for bruisers who take a few hits to kill someone (Master Yi). And Trackers is good against people who are easy to invade and cheese (Evelynn, Yi).

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Warrior Enchantment - Just by looking at the stats you can see how it is the best for Rengar. Lots of AD mixed with CDR is just perfect. This enchantment just adds power.

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Enchantment: Cinderhulk - Good for Tank Rengar as it helps with extra bonus HP and the AoE Damage passively. Getting this as your enchantment allows for early game sustainability as well as a healthier jungle clear.

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Edge of Night - This item offers a lot that Youmuu’s does but with a spellshield and health, however it doesn't have the CDR.

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Ionian Boots of Lucidity - An amazingly cheap and efficient item for Rengar due to the 10% CDR and 300 Gold savings from most boots. Good to get when you're in front early and looking to roam and snowball!

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Boots of Mobility - If you're behind and need to have more map presence to get yourself ahead, these help a lot. Plus they are an easy switch to Lucidity once you're in front.

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Ravenous Hydra - Ravenous Hydra just adds to the burst damage. With it's high damage built in and its AoE cleave, activating it makes one shotting much more simple.

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Titanic Hydra - A wonderful item for Tank Rengar as it's cleave damage it based off your HP. Rengar's high base AD means tank is still pretty good even without full damage.

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Youmuu's Ghostblade - Combined with your ult, noone can get away from you. It's Armor Pen is good and the 10% CDR helps a lot too.

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Infinity Edge - This item is really good on Rengar. Without the Crit Chance, his one-shot potential is amazing, but if you get a 20% chance crit, it's an easy kill.

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Bloodthirster - With your Q resetting your auto attack, allowing you to lifesteal inbetween comboes and lifesteal, this item's high AD and lifesteal perks helps to allow Rengar to 1v5, as well as fully lifesteal after a fight.

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Blade of the Ruined King - The extra % HP Damage helps with getting past the tough tanks like Voli and Garen. The lifesteal also helps if you subsitute BT for this.

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Lord Dominik's Regards - With a slight decrease in total AD, the armor pen makes up for it against big tanks like Garen and Volibear, as well as your passive means that the slightly lower AD is nothing. A good item when there are too many to deal with.

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Black Cleaver - This works well with tank rengar as well as normal rengar, as his full combo means all 5 stacks are on the target for full armor pen. This gives your team a major advantage in team fights against certain targets, as well as giving you 20% CDR and tank stats.

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Randuin's Omen - Good against ADC's and Yasuo. This shuts them down by decreasing attack speed and their crit damage.

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Spirit Visage - A really good item for the new Rengar as it gives lots of HP, HP Regen, CDR and MR, meaning he can sustain a lot while still outputting damage from other items. Also, the CDR can be converted into damage with the right runes!

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Rengar has a few combos that allow him to be diversely played instead of just a damaging stacking machine.
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1. The "team/gank" combo (used for allies)
Jump from Ult/Bush for first ferocity stack > E mid air > Q > W > E again for a snare (or Q if low enough).
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2. The "One-shot" (used for late game or solo kills)
Leap from bush or Ult > E mid air > Q after landing> W > Empowered Q > Dead
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3. The "quick thinker"[/code]
The normal combo except W if you change your mind on the engage or need a quick escape because the fight went badly.
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Here I go into depth with the champions Rengar could face in the Jungle. (Alphabetical Order)
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Amumu - Hard - 9/10 Amumu is one of the CC kings. He may not seem like he'd be able to, but he can kill you early in a 1v1 with his Damage over Time and his CC. Watch out for his counterganks, and be wary when taking his camps. He shouldn't come into your jungle though. As the game progresses, he will be harder and harder to kill unless you secure yourself a solid lead. When this happens, try to maintain vision instead of looking to kill him and catch him out with another ally. During team fights, try not to let him initiate by jumping onto squishies first. A good tactic would be to let him use his ult so his team feels a bit safer that your team is CC'd. Use this false sense of security to jump on the squishy targets.

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Diana - Hard - 9/10 Diana is one of the worst nightmares of every League champion. Although rather underplayed, Diana is a very strong pick into a lot of teams. Try to jump on her instead of her jumping on you, as you can kill her before her shield goes up, as well as taking away her damage. Like Akali, taking her camps early is a good idea before she hits her level 6 power spike. Counterganking her can go either way, leaving the option to focus another lane while she ganks more appealing. Keep viusion around your lanes and be prepared to either help them out, or score something off of her misadventures. Definitely build Maw of the Malmortius against Diana because as the game progresses, she will find it easier to kill you by catching you out.

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Ekko - Hard - 9/10 Ekko is tricky. Being high in mobility with lots of burst damage as well as high shields and CC, it's a matter of killing him either before he pops ulti, or saving your E until he's popped his ulti to secure the kill. CC from your laner helps too. Try to invade at your level 2-3 if he hasn't shown himself. If he gets ahead and goes tank, BoTRK or matching his tankiness is neccessary.

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Elise - Hard - 10/10 Elise is down-right a tricky champion to vs all throughout the game. You can't counterjungle her as she will burst you down at even level 2. Try to keep track of where she is on the map, as counterganking will be your only real chance of killing her early/mid.

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Evelynn - Easy - 3/10 Evelynn is quite easy to use as a snowball tool. Counterjungle and use pink wards to track her position for counterganks. Only when it hits late game, will it be more challenging to kill her. Just end it before then.

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Fiddlesticks - Easy - 1/10 Fiddle is an easy kill. From the start, he is squishy. Catch him out without his W heal and should be an easy kill. Early invades work very well on him, as long as you know where each enemy is on the map, so you don't get 2v1'd.

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Gragas - Hard - 9/10 Gragas is currently a very strong jungler. He does lots of damage as well as sustains his tankiness. Try to only fight him when counterganking or early counterjungling.

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Graves - Medium - 6/10 Graves is prone to being bursted early. He has good fight potential, and it grows as the game goes on. A level 2 invade can kill him while he's taking his red buff if you're confident. If he's ahead though, don't walk into his jungle as his changed Q and clsoe quarters AA's will destroy you.

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Hecarim - Hard - 9/10 Hecarim is strong after 6. Try to counter jungle whenever you see him on the other side of the map, or gank another lane. He turns tanky, so try to get your team ahead before this point.

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Ivern - Hard - 9/10 Ivern is a very unique jungles. With his play style, you need to ensure one of your buffs don’t get stolen early, as he can activate it and smite it instantly. After this, focus on quick early ganks, and try to fight him when you can. He is more of a supporting champion, so it makes a 2v2 basically a 2v1 in your favour. When he hits 6, play more around you team as he will most likely be able to get away from your assassination attempts. Aim the squishiest instead, or lock him down with an empowered Bola Strike for your allies to follow up.

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Jarvan - Medium - 6/10 Jarvan jungle is surprisingly strong. Counterjungling is an option, and you could probably get a kill from it. It is really hard to kill him in a countergank though, unless he is really behind. If he goes tanks, you will most likely need a Lord Dominick’s Regard, unless he is the only tank. Try not to mess with him in his jungle, and avoid counter ganking, just gank a different lane instead.

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Jax - Hard - 8/10 Jax is a difficult jungler to go up against. He is awesome in 1v1's, so counterjungling is very risky. The only chance you have to kill him is during counterganks. If you can't make it to the lane in time, just pressure another lane or counter jungle. Try to take his camps early game, as it takes him a while to hit his spike. The later the game goes, the more unfair the 1v1 matchup gets. Play with your team and try to catch him out, as his stun and ult resistances almost always mean that he gets away or kills you.

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Kha'Zix - Hard - 9/10 Kha'zix is one of your worst enemies. This one is a complicated match up, Pre-6, you win 1v1's. Post 6, you lose 1v1's. It really decides on who snowballs harders, or if you are next to a jungle camp when 1v1'ing.

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Kindred - Medium - 4/10 Kindred is the equivalent of an ADC. 2 shot her throughout the entire game. It's only until she hits 6, when she gets a little harder to catch out.

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Lee Sin - Hard - 10/10 Lee sin is very hard to play against throughout the game. Don't try to fight him, and only countergank if he is low. Just try to pressure the lanes he isn't ganking.

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Malphite - Hard - 9/10 Malphite is annoying in general. Don't focus him in team fights, or group really close together. If he's the jungler, stealing his camps is the best way to set him behind, or even killing him in his own jungle. Counter ganking is pretty effective too since his only getaway is his ult.

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Usually you start Red Buff with the help of your bot laners when you spawn on the bottom left of the map. If you start on the top right of the map, you want to start blue, so you also get the help of your bot laners.

Top Right of Map

Start in the bush next to Blue buff and jump onto it with Q activated. This should give you 2 stacks instantly. Kite the buff backwards through the bush, using leap for Lethality. I like to sneakily make my support take a hit or two, depending on their awareness. After this, put a point into E and move over to Gromp. Use AA > Q > AA > E > Empowered Q and then smite to finish it quickly and get health. After the smite, it will still have a bit of health left, so try to stack 2 bars of ferocity from your Q off of it, don't use your E again. If you only get 1 bar, that's fine. Walk to Wolves and throw your E at the smaller wolf closest to you over the wall (Should be easy even though you have no vision). Use Q and Empowered Q to kill the smaller wolves, then kill the big wolf using Q and E, using a health pot when necessary. Once you've cleared the wolf camp, put a point into W and run on over to the raptor camp, use a health pot if needed. Leap onto the closest raptor and Q > E > AA> W > Empowered Q to kill the first raptor, then killing each small raptor, primarily with AA and Q. Once the raptor camp is cleared, run over to Red Buff. If you have no Ferocity, leap onto it from the bush next to it and do the Q > E > AA > W > Empowered Q combo. If you have some bars though, hit it with an E over the wall to refresh your Ferocity bar timer, and combo it with Q > Empowered Q > W or Q > W > Empowered Q. Smite red when it's near dead, as you will be half health-ish otherwise. Then use a ward to ward Kruggs and jump over the wall. When you leap, do the Q > E > AA> W > Empowered Q combo, and kill the Kruggs. From here, either get scuttle or look for a top gank. If you can do neither, recall, buy items, and get right-side river scuttle and look at a mid or bot gank. If your bot lane has made the enemy back or almost killed them, call them over for a sneaky early dragon.
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Bottom Left of Map:

Put your first point into Q. The way you want to start Red Buff is with being in the bush next to it, then leap to it and Q > AA > AA > AA > Q etc. This makes it so you can get an extra Q in or two before moving onto Kruggs. After Red Buff, put a point in your W then ward Kruggs to easily jump over the wall to hit the small Krugg. As you land on the small Krugg, use Q > AA > W > AA using the Empowered Q whenever it comes up (depending on how many stacks red gave you). Make sure to always press Q the moment your auto attack registers and Q again instantly as your ferocity hits 4, since the 2nd Q cancels the animation as well. Then AA > Q > W > AA until the Kruggs are dead. Head on over to Wolves and take our the smaller wolves first, then the main one. After the camp, you will be level 3, put a point into your E and go to Blue Buff. When attacking Blue buff, make sure to get the point of ferocity from leaping out of the bush, followed by a Q > E then waiting to get hit by it once, then W > Empowered Q and kill the buff, you’re able to use smite here depending on your HP or need to rush the camp. Go over to gromp, kill it with or without smite (depending on blue buff) and continue to Scuttle Bug in the river, followed by a top gank, mid gank, or jungle invade. Usually I quickly scope their Red Jungle by following the () line, then leading into a top gank. If none of these options are available, just recall, buy items, clear the Raptor camp, and look at perhaps ganking either mid or bot.
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When you get to mid game, the ideal situation is you having 5 or more kills, a few stacks on your necklace, and at least two of your lanes ahead/fed. Your role now moves on from assisting your lanes, too catching people out in alone lanes and killing them to push the tower. Do this for every 1st Tier tower if it's not already down, and when they are, switch to getting objectives such as dragon or rift herald/baron instead. With a dragon or too ahead, Team Fights and 2nd Tier towers become your main focus. With this kind of lead either finish out the game, or drag it into late game. Luckily, late game becomes a sinch.
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Usually, the Late game wouldn't really come if you're ahead as someone like Rengar. If you are still unaware at shotcalls to end the game, late game can sneak up on you and the enemy can start getting stronger and your lead smaller. If this does happen, in team fights try taking out the ADC or APC first, as they will do the most damage on the enemy team. Use the "One-Shot" combo to kill these two, and the "Team/Gank" combo to keep the rest held in place so your team can follow up and kill them. Keeping the jungle warded is also very crucial, as it can lead to a kill on a wandering ADC, meaning team fights are so much easier, and you can take baron/inhibs.

Warding Spots:
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I really hope you enjoyed this guide, and feel like playing Rengar a lot more now! It'd be awesome to see more Rengars on the rift. Please comment with any feedback and give it a vote, everything is appreciated! Also looking to add a "results" section for how this build worked for you! Feel free to comment them.