(2) Set Bonus: When Agony grants you a Soul Shard, you have a chance to gain Cruel Inspiration, increasing your haste by 12% for 6 seconds.
(4) Set Bonus: Cruel Inspiration also grants 2 charges of Cruel Epiphany, up to 5 charges. Each charge of Cruel Epiphany increases the damage of your next Malefic Rapture or Seed of Corruption by 40%.
Demonology
(2) Set Bonus: Demon Bolt and Felstorm damage increased by 20%.
(4) Set Bonus: Demon Bolt has a chance to make your next Hand of Gul’dan instant and deal 50% increased damage.
Destruction
(2) Set Bonus: Consuming Soul Shards has a chance to grant you Chaos Maelstrom, increasing your critical strike chance by 10% for 10 seconds.
(4) Set Bonus: During Chaos Maelstrom, your Chaos Bolt, Conflagrate, and Incinerate critical strikes explode on the target, dealing 2-10% of damage dealt to enemies within 8 yds. Damage reduced beyond 5 targets.