Why does Kha'Zix's W, Void Spikes, heal scale with AP?
I understand that once upon a time there were several ways that you might find yourself with a little bit of Ability Power from Runes, Masteries, or hybrid items like old Trinity Force, .. but now, .. there is really no good reason to have Ability Power on Kha'Zix unless you're building Hextech Gunblade, which already gives you sustain, .. or Guinsoo's Rageblade, which doesn't make much sense on Kha'Zix because he isn't a great on-hit champion.
So, ... why?
Should this be changed?
Or should this just be an odd ability that he has for no good reason?
Or, is there some obscure build that I'm missing out on? Is AP Kha'Zix actually a real thing?