Rengar, The pridestalker.

The latest champion in the league is an melee, fighter, jungler, stealth champion which is best used as an jungler or solo top.

The key of playing rengar is, he hunts for prey, so don't try to take on tanks in 1v1 because you will fail, don't be afraid to buy some wards and hunt down low enemies.
At all times play careful, you may look tough but you are quite vulnerable.

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On every wall of his den, the trophy hunter Rengar mounts the heads, horns, claws, and fangs of the most lethal creatures in Valoran. Though his collection is extensive, he remains unsatisfied, tirelessly seeking greater game. He takes time with every kill, studying his prey, learning, and preparing himself for the next encounter with the one monster he never managed to defeat.

Rengar never knew his real parents, but was raised by a human who was revered as a legendary hunter. He was an ideal pupil, intently absorbing the lessons of his father, and improving them with his uncanny feral instincts. Before his mane had fully grown, Rengar set off on his own and claimed a wide territory for himself. Along its perimeter, he mounted the skulls of his slain prey - a warning to would-be aggressors. He thought undisputed reign of a region would fulfill him, but instead, he grew restless. No beasts in his domain proved challenging prey, and without formidable adversaries to push his limits, Rengar's spirit waned. He feared that no worthwhile game remained, that he would never again feel the thrill of the hunt. Just when things seemed their bleakest, he encountered the monster. It was a disturbing, alien thing, distinctly out of place in his world. It bore huge scything claws and devoured any animal that strayed across its path. Overzealous at the prospect of a challenge, Rengar ambushed the monster in haste. It far outclassed anything he'd hunted before. Their fight was savage, and each suffered crippling wounds. Rengar lost an eye, but the most grievous blow was to his pride. He had never before failed to make the kill. Worse yet, the severity of his injuries forced him to retreat. Over the following days, he hovered on the threshold between life and death. He was wracked with pain, but beneath it, he felt a glimmer of joy. The hunt was on. If such powerful beings existed in the world, he would find them, and stack their heads high. The monster, however, was a kill he wanted to savor. On his den's largest wall, he reserves a space for the beast's head, a trophy he swears will one day be the centerpiece of his collection.

"Prey on the weak and you will survive, prey on the strong and you will live."
-Rengar

Pro's

High early game burst with Q
Great healing ability
Slow/stun
Increadible ult when timed right
No mana

Con's

Slow starting speed in the jungle
No reliable AoE damage
Q doesn't aply on-hit effects
you can't effectively gank mid without ult

Ferocity is rengar's passive.
Instead of mana renga's abilities give ferocity, after 5 stacks he gets an empowered ability.

Q. Savagery, Ferocity Bonus: Q deals 150% of ad and his Attack Speed bonus increases.
W. Battle Roar, Ferocity Bonus: Rengar heals himself for 15% of his max hp
E. Bola strike, Ferocity Bonus: Rengar roots the target.

When playing Rengar you'll need to practise the timing of your abilites, try to always have 3 or 4 ferocity stacks so you can either slow and double Q or just double Q.
When initiating use the ferocity on W for the healing and the resists

Well as an jungler you dont have many options for spells.
ALthough you can take exhaust instead of ignite as an solotop.

Flash is a must for escapeability, his only other way to escape is by using his ult so i don't recommend Ghost

Heal is kind of an waste since you heal more with an ferocity empowered Battle roar.

There are 2 viable ways of runes

Marks and Quints:Flat attack damage or armor penetration, this is for both marks and quints

Seals: For jungle is armor is advised, altough attackspeed is usefull too.

Glyphs: I prefer Flat mr over mr per lvl but that is just my opinion. cooldown reduction can also be usefull

Well this is a major point for rengar.

There are so many options like: Trinity force, Bonetooth Necklace, Spirit Visage, Bloodthirster, Brutaliser or Bloodrazer.

Trinity force: I don's use trintyforce because i think its too expensive, You Don't use the mana and crit isn't really usefull on rengar either since his Q doesn't apply on hit effects. The benefits however are great, the sheen passive gives an massive damage boost and the movement speed is also usefull

BOnetooth neclace: It's a fun item and definetely an option however except for the armor pen and movement speed i don't really see its impact.

Spirit Visage: Good cheap item, boots your heal more and gives surviveability.

Bloodthirster: Good item if you go down the damage path.

Brutaliser: Good item, if you CAN buy it in early-game, you should!

Madred's Bloodrazor Good item however i dont see rengar as an attackspeed champion but it is possible given the 100% attackspeed buff from Q.
Remember if you plan on buying Madred's as an jungler, you shouldn't upgrade razors to lantern but wait to upgrade it to Bloodrazor

Rengar has this special item, the bone tooth necklace.
Its a little similar to Viktor's Hex core but Rengar doesn't start with his item.
I think this is a shame because I think its too expensive compared to what it does.
At lvl 18 it gives 46 AD, seems nice for just 800 gold but you have to buy it as early as possible to start stacking.
Example: If you buy it at lvl 6, you get 22 AD, this is bad.
but you will start stacking really fast since it gives stacks for assists too, lets say at lvl 10, you have 4 or 5 stacks. you now have 30 AD, 10 armor pen and 5% CDR for 800 gold.
Compared to the Brutaliser which costs 1337 gold and gives 25 AD, 15 armor pen and 10% CDR, this is about the same.
But you can keep building the brutaliser to Ghostblade.
If you reach 6 stacks you get +25 movement which is just nice but not really necessary if you have frozen mallet.
After that you get increased leap range which is just useless unless you want to gank mid, but by the time you reach 9 stacks begin game will be over.
At 14 stacks you get an additional 3 seconds on your ult, well could be nice but not really necessary, just use your ult 3 seconds later.
You also get an additional 1 ferocity with the next ability you use after your ult.
Example: you ult, giving you 5 ferocity, you dive with Q dealing nice damage leaving you with 0 ferocity. you use W and E to finish him giving you 3 ferocity and all your abilities on CD.
Q will come off CD first leaving you with 4 ferocity. W and E will come off cooldown at about the same time so you can use 2 abilities but only have to use 1. which makes it pretty useless.
additionally, you cant get more than 14 stacks so once you die you always end up with 13 stacks unless you kill someone after you died but that is pretty hard as rengar.

Summary: I don't buy bonetooth necklace, I prefer Brutaliser because it does nearly the same but is more reliable.

I have tried various Jungle routes,
The one i found most resourcefull is, Red, Wraits, Wolves and Blue Followed by a gank on bot
Another one is start wraiths, Red, Golems and gank top, however killing golems so fast is hard
You could also give Blue buff emidiately to your ap carry, however you miss alot of experience early game so you might get underleveld

Rengar is a good farmer because of his passive.
if you stay in the bush you wont get any damage and just leap out if a minion is low.
you could use Q for creeps because the cooldown is low but it makes you vunerable since its his main damage tool.

In late game farming is easy when you have 4 or 5 ferocity, double W kills all the creeps except the siege minion.

This is the most easy part about rengar.
begin with W so you will get less damage and kill the main creep with Q.
You can spam abilities and use charged W to heal, or you can use abilities untill you have 3/4 ferocity to gank.

-Ranked will soon be added after i tried it a couple of time-

Rengar is harder than he looks at first,
but be patient you'll get a hang of it
I think the champion looks good and has an epic dance.
He can be built in lots of ways and be a great addiction to every team.

I hope I helped some people who are still having trouble with rengar.
Please leave a comment with feedback, tips or grammar errors.