My one big concern from looking at the kit for drk is there's too much behind dark arts now, almost everything can be darkarts in our dps combo and our mp recovery is halfed by being able to use only one of our blood weapon/price buff.

I'll have to see come the final build but right now drk looks like it's a bit off balanced in the mp it needs verus the mp it gets back

I for one would take the darkarts potencies on blood skills and make them the regular potencies.
I would also reduce dark passenger's mp along with the blackest night to not cost the same as a dark arts
maybe a half a darkarts will a longer cooldown on night