Rengar is one of my favorite champions as I main top lane. His assassination abiity is the main reason I like him, he can kill a champion in one foul swoop of his claws.

Pros

+Incredibly high burst damage
+Best tower killer in the game thanks to Savagery
+ Auto attack range "increased" to 600 in bushes
+ Bonetooth Necklace super cost effective
+Stealth
+Lane sustain and durability from Battle Roar
+One shot squishes as early as the 12 minute mark




Cons


-Your text to link here...Vision Ward and Oracle's Elixir are annoying
-Getting camped by enemy jungler can set you back

- Squishier than how other Rengar guides build him
-Not max cooldown reduction on this build
-Is somewhat kiteable
-Can be very hard to carry by yourself (assassins in general have this problem)

Ferocity is gained when Rengar hits an ability on a minion or enemy champ at 5 stacks of ferocity his abilities are empowered giving them improved effects such as more damage, helth regen, or rooting the target. When you gain the 5 stacks of ferocity try to use the empowered abilities on an enemy champ.

I have told you all I think you really need to know about Rengar, but the best way to learn Rengar is to play him. Play a couple bot matches with him and get the feel for the awesomeness that is Rengar.