1 Runes
2 Masteries
3 Skills
4 Items
4 Jungle & gank

Quintessence
Best gank and for clean faster your jungle.

Mark
Damage early game for jungle

Seal
For an easy jungle

Glyph
More tanking or Reduce ability cooldown for spam

21 in offence :
- damage
- upgrade exhaust
- Executioner
9 in defence :
- armor
- regeneration health
- reduce incoming damage

Max first "Savagery" for good early damage and clean your jungle.
Max second "Bola Strike" for a better slow

Rengar Skill can be increased with ferocity, you win ferocity when you do your skill ( on an enemy, spam q when nobody next to you no work, ferocity do not increase).

Ultimate before the teamfight for see all enemys ( Ultimate ranged really good )
On teamfight, start with Battle Roar for more durability and bola for slow the focus.
Spam Savagery.
When Battle Roar come back, do it again.
If you tank try to do Battle Roar with ferocity or if nobody focus you, do it on Savagery.

Build OFFTANK

No strong damage early game but mid and late game, you are unstoppable.

Build "DPS"

Strong damage early with brutalizer and CDR, but take care teamfight, you're not a real tank.

Spam your skill and do your ferocity on battle roar if you are not full life or do it on savagery.

His Ninja gank is stronk because of his passive.
For Midlane, you can gank with lvl 6 or if the mid lane is push.

His ultimate is stronk for gank, do bola with ferocity for stun the focus.