I thought of trying that, I just really don't like %maxhp true damage. It's weakish on low hp targets, absurd on high hp targets. As well, if it only ticks one turn I can't get that delayed damage effect that I want so that I can put more damage in the skill without making it OP by doing so.

I'll probably experiment some more once I've gotten enough time with Dark Souls 3 to be able to put the game down.