While casting his ultimate Vel'Koz has an increased hit box size. Can be reproduced by going as close to fountain as possible w/o triggering fountain beam and then ulting, you will then be hit by the fountain.
Vel'Koz's Critical hits go on a faster to hit and faster animation speed than his normal attacks. Also there is a Stutter in his animation for hi Critical hits.
Passive bug: getting full stacks with passive using Void Rift [W] does not always proc his passive on minions.
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