Decimation

This one: Gain the Decimation ability: Reduces the cooldown of your Soul Fire….

• Decimation · spell 440870 · Fire · Reduces the cooldown of your Soul Fire spell by 90%. When you cast… · Warlock talent
• Decimation · spell 440873 · Fire

Values as each build had them, not tested in play.

1. Forever 1.60.1.69913vs Era 1.15.9.69722
   Description, Era 1.15.9.69722

   Gain the Decimation ability: Your Soul Fire spell no longer has a cooldown. Additionally, when your Shadow Bolt, Shadow Cleave, Incinerate, or Soul Fire hits a target that is at or below 36% health, the cast time of your Soul Fire spell is reduced by 41% for 10 sec. Soul Fires cast under the effect of Decimation cost no shard.

   Description, Forever 1.60.1.69913

   Gain the Decimation ability: Reduces the cooldown of your Soul Fire spell by 90%. When you cast Shadow Bolt or Searing Pain on an enemy below 35% health, they deal 0% increased damage, and for the next 10 sec your Soul Fire spell has its cast time reduced by 40% and costs no Soul Shards.