[Autumn]

I'd rather it sap your current health% and deal it as dark damage, scaling in health per rank to let you choose how much you're sacking, that way its not a huge nuke unless you're at full health, and is a good way to reduce your HP for ghost benefits like rising game and ether invite.

Current health is the way to go without encouraging 1k HP tanks with sustain using it for their sole damage source.