User blog comment:SpringBossLP/Kassadin Rework Idea/@comment-24862418-20180920230746

I agree with GreenMoriyama, there is a lot of missing information. It is hard to judge your kit other than it lacks of information.

His Q has both silence and wave clear. I don't think Kassadin should have them. He is a mobility assassin. Give him wave clear, and he is an uncatchable pusher. He already have some backdoor potential.

Void Blink and Null Area seems repetitive. Both create a mobility zone for Kassadin. I would suggest to combine it to one kind of zone, E would increases the zone stat (movespeed, slow, etc) for both E and passive. And maybe E active would make a different shape to make it more interesting.

Your kit has 4 mobility spell. One of the most mobility-kit designed is Rakan, so I think you can learn something from his design.