Basically this guide is just a template of the currently really popular Rengar build on IPL5. Any comments or corrections are more than welcome.. And if people wish for it, I can write more in detail guide about this play style which I personally have been experimenting a lot on Summoner's Rift and Twisted Treeline with pretty good results. (So far easy wins on 1vs1 against champions such as Jax, Teemo, Irelia and few others..)

Basic idea of the build: Harash enemy with W and E, keep healing up with W as often as possible.

The item build order isn't absolute and you should experiment yourself on the order which you want the items, but rushing Kindlegem is highly recommended. Also starting with Doran's Blade works well against dueling melee champions such as Jax / Irelia. ALSO, if you end up falling behind in last hits, picking up early Heart of Gold can be good idea.

IMPORTANT: Every time you fight the enemy, start with the quick W on enemy player or minion, because it gives you huge armor and magic resist boost in early game, which helps you to take less damage in the exchange. And mostly try to save ulti only for sure kills, but main priority of ulti is to give you really safe escape mechanism, so don't waste it.