Quote Originally Posted by Kabooa View Post
Let's not kid ourselves, the MP from Bloodspiller wouldn't be spent on future TBNs. It's a bonus over what's already in use. It'd be excess and going straight into Dark Arts.
Since MP is potency, MP on Bloodspiller would increase Bloodspiller's effective potency, which would, I believe, make TBN a DPS gain over DA. I'm not good at doing all of that math stuff but right now, TBN is only a loss of about 3-4 potency on average, so if you put an MP regen on Bloodspiller, TBN would certainly become a flat potency gain in every scenario.