It should remove the entirety of mark at least (this comes from a Nightblade player). I like that its number of affected targets is falling. Thoughts on this additional change?
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The less debuff/dots it remove, the better it is (a player who spend time to apply multiple debuff and dots shouldn't see it entire work wasted, except against templar). But I agree, mark target and all multi-debuff attack should count as only one debuff.