Topic What stat improves dark apoth???
How exactly when you have both at the same time? Not to mention Nether plating.
For PvP, it can be very much worth it. Darting around with demonic leap and being more melee-oriented spell caster can be hella fun. And let's not forget Aura of enfeeblement.
I find Mastery for DA to be pretty low on priority, because the scaling with the damage reduction is pretty bad. At the moment, my stat priorities are as follows: Haste > Crit > Mastery.
Haste lowers CDs, Soulfire casting time(faster molten core casts), Immo aura speed, Dots, you get it.