Hello and welcome to my jungle Rengar build! I have been using Rengar since he came out and their is only one thing that bothers me about him. Most people add no tankiness to him ruining their chances to jump in and escape safely. Without tanky items he is very squishy. This build/guide will go over his path, pros/cons, items, runes, and extras. Please enjoy!

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

In my opinion Rengar is meant to go and pick off individual targets then get out again, he is also good a SECURING kills. He has great escapes, ganks, damage, and in my build survivability/sustain. He isn't that useful in a team battle because he is mostly based on 1 target at a time, although he can take out their carry or mage and then run.

Pros:
~Rengar has great sustain thanks to his 5 feriocity + Battle Roar.
~His ganks are amazing thanks to his Pounce passive and slow.
~He clears camps pretty fast.
~Rengar can run different paths if needed.
~No mana means you wont have to basic attack a lot.
~He is the master of grass/bushes.
~He looks Bad-***.

Cons:
~Gets Targeted in team fights.
~If you can't escape from some fights you will die.
~Kind of week early game.
~If you can't stay near grass/bush you're done.

For Rengar I think using a RED path is much better because he doesn't run off off mana so he doesn't need blue very badly. His paths goes as followed:

~Smiteless~
-Red Lizard Camp (No Smite)
-Blue Golem Camp (Smite)
-Wolves Camp
-Wraith Camp
-Golem Camp

~With First Smite~
-Red Lizard Camp (Smite)
-Wraiths Camp
-Golem Camp
-Wolves Camp
-Blue Golem Camp (Smite)

I recommend the first (Smiteless) path choice as it allows you to secure your buffs and gank faster. Although you will need a very good leash on the first camp for this path choice.
TIPS: Don't forget to gank during these camps and whenever else you can.

Marks:
Mark of Armor Penetration: These allow you to do more damage to targets by making part of their armor useless.
The Mark of Attack Damage works the best for Rengar because it lets him deal good damage since he is a Damage based champion.
Seals:
Seal of Armor is the best thing on Rengar because it is really the only thing to use for junglers. It is always a must. There is no substitution.
Glyphs:
The 3 Glyphs of Armor may seem pointless to most, although to me it allows you to exit the jungle with more health. Most of the jungle monsters deal physical damage so this helps resist that damage. The 6 Glyphs of Scaling Magic Resist is good because they help resist any magic damage dealing target and since they're scaling they allow for more magic resist as you level up.
Quintessences:
2 Quintessences of Attack Damage and 1 Quintessence of Movement Speed allows you to have the damage to clear faster while also giving you chasing speed while ganking.

The masteries are pretty easy to justify. 9/21/0 is best on him because he is pretty squishy so the 21 in defense allows you to stay in the jungle longer. The 9 in offense just allows you to do that little extra damage, you are a damage dealer after all. The only other choice would be 21/9/0 but that makes you more vulnerable to the monsters damage.

For Rengar as I said before most people make him a glass cannon, but I like him to have a bit of tankyness to him as well. That's why my items are as followed:

Hunter's Machette+5 Health Potions: This is what all junglers must start with at this time, therefore you start with it.

Bonetooth Necklass: It's made for Rengar, so you should use it. It gives a little bit of damage, and it's stacks are phenomonal.

Vampiric Scepter/The Brutalizer: This allows for some Life Steal and Attack Damage early game, plus it will build into The Blade of the Ruined King and The Black Cleaver later if you follow the build exactly.

Mercury Treads:This gives the average amount of Movement Speed, along with some Magic Resist, and Tenacity. It is a must for almost every tanky/bruiser jungler in my opinion.

Blade of the Ruined King: This is one of the best items on Rengar in my opinion. It Provides a good amount of Attack Damage, Attack Speed, Life Steal, and a pretty good activated ability as well. A must on any Rengar.

Frozen Mallet: This provides some damage, along with 700 health, and an on hit slow. What's not to love.

Ravenous Hydra: Another good Attack Damage, Life Steal and activated/passive ability item. A need on any Melee Champion who is building Attack Damage in my opinion.

The Black Cleaver: The Black Cleaver provides a nice amount of Attack Damage, 200 Health, Cooldown Reduction, Armor Penetration, and a good passive and stacking effect. Can be replaced if needed, but I recommend keeping it.

Other items that are suitible for this hunter are as followed:
~Maw of Malmortious
~Sunfire Cape
~Warmog's Armor
~Ninja Tabi
~The Bloodthirster
~Trinity Force
~Spirit of The Lizard Elder
~Randuin's Omen
~Atma's Impaler

It is crazy obvious what Summoners you need.

Smite: You're jungling. You need it. That simple.

Ghost: While you are hunting them, you need to go fast enough to catch them. Ghost and your ult allow you to catch nearly anyone you want.

The only other thing you could use if needed would be flash, but it wont do as much for you.

Rengar's skill sequence is very easy to explain. You want your Savagery (Q) first because it gives you high damage and it's a lower cooldown, which is great while jungling. Next you want to get your Battle Roar (W) because it will deal high damage to single targets. Then your Bola Strike (E). It is useful while ganking so you get it last. Obviously you will get your ultimate Thrill of the Hunt (R) because you always get your ultimate at level 6, 11, and 16. I like to max out my Savagery (Q) first because it does a really high amount of damage, especially when you have 5 Feriocity. I max my Battle Roar (W) next because it does an alright amount of damage and heals you. Next my Thrill of the Hunt(R)because it's your ultimate. Finally you max your Bola Strike (E) last because it is only used for ganking and even at level 5 it doesn't do much damage or seem to have enough slow to rank it first.

Thanks for Reading and using my build, I hope it helped you. Leave your comments if you want to know something or have helpful criticism. Rate my build if you liked it please.

Thanks
~Koersy14
(In Game: The8thGeneration)