Mario's Luminous Skill Guide.

Why would Dark crescendo expire if you stop attacking? Its a constant buff, atleast in the recent kmst patch it is. Also, I think you don't know the skill. Its 1% increase up to 30 times. This is the exact reason why I pushed it back a bit and took masterys over it.

I've been told that every time it activates, it refreshes the entire buff's duration, so it would not expire unless you stopped attacking for 60 seconds. Therefore, one point is a 10% increase in damage since level 1 stacks 10 times.