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Ok so I was play a normal game on the three v three map using Battlecast Vel'Koz and in the middle of the game I loose the ability to cast my ult. I was able to use it two times and that was it, after that it would not case. This is a very serious bug, I don't know if its the skin that's bugged or just the champion but something went wrong. Riot please fix this as soon as you can.