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When activated, the ability takes almost .5-1 seconds to "charge up" before the effects even happen. When activated and hits a target immediately after, it does not apply the damage, this is extremely obvious when mundo has increased attack speed. This can be tested simply by going to game, building some attack speed, and trying it yourself, I hope you fix it soon because mundo is a very fun champion to play but is handicapped with this bug. The difference between doing that extra 100 damage could be crucial to the game.