The Furnace Seraph's Verdict

2 pieces: (2) Set: Increases the chance for Shadowy Insight to trigger by 25%. When consuming Shadowy Insight, Mind Blast deals 40% increased damage and generates 4 additional Insanity.

4 pieces: (4) Set: Devouring Plague damage increased by 18%. Every 4 casts of Devouring Plague increases the damage of Shadowy Apparitions conjured within the next 10 sec by 100%.