Some simple DRK changes, and why they would improve things.

[Crater]

I like your ideas, apart from making Quietus no longer restore MP without Blood Weapon.

My wording may have been ambiguous. The idea was not to take away the MP generation from Quietus - only when Quietus is boosted by Dark Arts. It would be similar to Carve and Spit, in that you use the skill without DA if you want extra MP, and you use it with DA if you want high damage (except unlike CnS, the MP-generating, non-DA version would generally be the winner in terms of efficiency).