Curse Mastery- Grants each of your curses a secondary effect as follows:
Agony: Gives a chance when dealing damage to afflict the target with chest pains, stunning them for 3 seconds.
Doom: Reduces the time for the damage to be dealt by 10 seconds.
Elements: Additionally increases damage done by DoT effects by 10% (Magical DoTs, Bleeds, Diseases, the works)
Exhaustion: Immobilizes the target for 2 seconds whenever Curse of Exhaustion ends.
Recklessness: Causes the target to damage themselves for 5% of the damage they deal for a maximum of 20% of your total health per attack/spell.
Tongues: Increases mana cost of spells by 10%
Weakness: Increases Rage/Energy/Runic power ability costs by 10%
Sounds fitting, no?