Kayn too safe
I feel that kayn is too safe and too strong at this point in time. There should be a window of vulnerability after he comes over a wall, perhaps a slight delay before attacking or an animation. Also he should have to commit when leaving a wall; often I see a kayn come out of his safety of the wall into a bad spot, and then up and change his mind. Mistakes like these should leave him open for attack for a few seconds. Between his legendary escape abilities and how he can enter someones body, do half their health, and heal off of it, it just seems that he is lacking a little bit of punishment.