Quote Originally Posted by Marxam View Post
Dark Arts:
-60 sec recast
-Grants 3 stacks of Dark Arts, 15 sec duration
-2 charges

Actions affected by Dark Arts:
-Syphon Strike = increased mp regen
-Souleater = increased damage, action changed to power slash
-Stalwart Soul = increased damage, reduce recast of abyssal drain (and C&S) by 5 secs
-Unmend = increased enmity, reduce recast plunge by 5 secs

Abilities affected by Dark Arts:
-Dark Mind = increased from 20% to 30% mag reduction
-Abyssal Drain = cure potency increased to 400
-Carve and Spit = Restore additional MP
-Dark Missionary = Increased from 10% to 15% mag reduction

In most scenarios you would use up 2/3 stacks just doing your single target rotation once. Which leaves one stack to use for an ogcd.
The problem with the system as you've written it though, is that it pits utility against optimization; despite the intent, as long as any of the options contribute to damage and the others do not, most of these options will in fact be avoided with DA active, unless the alternative is overstacking/wasting them, or imminent death.