User blog comment:Grrrbear26/Kassadin is broken, and I have the glue!/@comment-10768370-20150208092855

I personally think that Nether Blade could use a bit more nerf. I mean, if you're out of mana you just have to activate a free ability to gain 16% of your missing mana back which frankly enough is a LARGE amount. I would just remove the doubled mana-gain on champions but maybe I'm a bit extreme :[ I just think he gains way too much sustain.

About the passive shield, I'd lower the per-level-scaling. Going with this he'd have a 270 shield at level 18 without even calculating in the AP. And the fact that it's activated by every ability makes him a full-go-in mage because he gains tons of durability with it.

About his riftwalk, I'd increase the mana-cost per flux and the damage per flux. I really like the concept of flux, it has a large amount of possibilities but going with this his ultimate still wouldn't have that much of a punishment until the fourth flash. And that punishment is slightly over the top. Nerf it to 10% and you'd be good as well.

All in all, nice changes. Just some of the numbers are a bit off :)