Time: Anytime
Frequency: Always
World name: Cactuar
Character name: Maldren Stratovarius
NPC name: N/A
Monster name: N/A
Class/Level: DRK/60
Party or solo: Any
In-game time: N/A
Area and coordinates: N/A
Steps:
1. Cast Hard Slash
2. Cast Syphon Strike
3. Cast Dark Arts
4. Cast Carve and Spit
5. Before the animation is complete, immediately cast Souleater.

Ostensibly, this could work for any dark arts effect ability, as long as you slide it in before the Carve and Spit animation is complete. The result is you will see two instances of "You lose the effect of Dark Arts" on both the screen and the combat log, yet you have reaped the benefits of whatever ability you use it with (Such as the enhanced Dark Mind/Dark Dance or Enhanced Souleater potency) while also receiving the 400 potency Carve and Spit.