Kah'Zix Buff

I really feel that needs a buff, He can utterly destroy someone when they're isolated, but lacks the means to do almost anything when its a group of 2 or more. He's a really fun champ to play, almost nobody plays him though because hes been nerfed so severely. I think Void Spikes needs a buff and he needs some type of magic damage relative to the target's health. Comment your suggestions.

I played kha'zix in a ranked game yesterday and got told by everyone that i was dumb for picking him because hes completely obsolete.