I love to play Rengar and this is just a Build for Oneshot i don´t say much about Offtank or so! I am sry for my bad Englisch but i am German and not an English God

Pros:
-High Dmg
-Invisible
-High Snowball Potential
-Great against Squishys
-Nice Gapcloser with Bushes

Cons:
-Gets countered by Pinks/Oracle
-Pretty useless without ult
-No Gapcloser without Ult/Bushes

Normaly u want to Max your Q first get E second for the extra Burst and the W. If you get stomped inlane it can also be good to Max W first for the Sustain. Secret Tip: Look if your enemie got Mr. If he has no Mr u analso Max W and buy Sunfire first, this works often because the Enemies dont think about your Magic Dmg.

In Teamfights u try to get one of the Enemie Carries when they are splittet from their Team or when they have a bad Positioning. Try tonot Fight without Ult (you are so useless without) Tell your Team how long your Cd for Ult is and tell them if you have it for a Fight.