Revanchion
Found in Dire Maul.
Item Count Chance 
Corruptor's Scourgestone1 100% 
Cloak of Revanchion1 33.3% 
The Shadow's Grasp1 33.3% 
Bracers of Mending1 33.3% 
Jeering Spectre's Essence quest1 20.0% Ability 
Frost Nova
Shadow Bolt VolleyZone Spawns Coordinates Dire Maul 1 instance