Grim Inquisitor's Regalia

2 pieces: (2) Set: Each Soul Shard spent on Hand of Gul'dan increases the damage dealt by your next Call Dreadstalkers by 4%.

4 pieces: (4) Set: When you cast Unstable Affliction or Seed of Corruption, all targets within 60 yards suffering from your Agony take 15% increased damage from your Corruption and Agony for 8 sec.