WoWDB

Rank 1: The Heart of Azeroth erupts violently, dealing 0 Shadow damage to enemies within 12 yds. You gain 25% critical strike chance against the targets for 10 sec.

Rank 2: Cooldown reduced by 25%.

Rank 3: Increases your critical hit damage by 25% for 5 sec.

Rank 4: Blood of the Enemy gains an enhanced appearance.

Rank 1: Your critical strikes with spells and abilities grant a stack of Blood-Soaked. Upon reaching 40 stacks, you gain 0 Haste for 8 sec.

Rank 2: Each stack of Blood-Soaked grants 0 Critical Strike.

Rank 3: Blood-Soaked has a 25% chance of only consuming 30 stacks.