Talk:Kha'Zix/@comment-2.126.80.41-20130129175131/@comment-84.251.20.14-20130129215148

You should level and evolve W first for better waveclearing, poking and sustain. Level Q second, its damage is good enough even without evolving it. E should be evolved second and leveled last; having a reseting leap with long range is what makes Kha'zix the effective assassin he is. This is also where more teamfights and skirmishes start breaking out, so it'll come in handy when you need it the most.

Which skill to evolve last? is a common topic, but most people (including me) opt for evolving R. You'll become more slippery and the damage reduction is nifty against skillshots you can't avoid and specific skills such as Zilean's bombs and Fizz's ultimate. The bonus damage against isolated targets from evolved Q is rather negligible.

Ravenous Hydra, Infinity Edge and Blade of the Ruined King aren't really bad, but you'll deal more damage with your skills if you buy Black Cleaver and Last Whisper (which are also a lot cheaper). Bloodthirster is a fine purchase since it gives the most AD, no problem there. You should probably swap Frozen Mallet for Warmog's Armor since it's quite a bit cheaper, makes you harder to kill and the slow is kind of wasted on him since he already has so much sticking power and mobility, same goes for Boots of Swiftness; you're better off with Mercury Treads for the added magic resistance and tenacity or Boots of Mobility if you like to roam. Most Kha'zix players also buy Tear of the Goddess very early (and upgrade it into Manamune) since he can be very mana hungry during extended skirmishes and teamfights.

If you're jungling, Spirit of the Elder Lizard is a good purchase since the true damage burn is applied by your W and it gives a decent amount of AD and CDR, all good stats for Kha'zix. Other than that, the skill/evolve order should be the same as when laning.