I think it was called IceInfernalBirthMissile.mdx. It's gone now, can't find it lols. You've checked the map? One ability called Tidal Wave seems to leak but I can't find the problem, (try cast 10 times on 30 creeps and lag builds up!;(
I think the leak is of type "offset by distance from center of Rect"...correct me if I'm wrong