Originally Posted by Gypsy Hyena
Rengar's fairly weak when he's not botlane, because of his reliance on bushes that only really populate a ring shape in the middle of the arena. His only real gapcloser is his ult, but it's a mess right now and the cooldown is way too high, without him having any CDR items that really synergise with him apart from zekes herald.
CDR boots are great, Youmuus is boss, Cleaver is OK if you have youmuus and LW already, Spirit visage is the go to MR+health item for him and offers CDR on top of it...
Try Brut+Ionians > SotD > IE. SotD can be activated without breaking ult stealth, so out of nowhere its OMGWTFBBQROFL3CRITSIMDEAD on anyone without 150 armor and 2.5k+ health.