Fueled by Death

Fueled by Death is a  passive skill, unlocked at level 10.

In-game
The 3% bonus is added per corpse consumed, not per cast. Each stack refreshes the duration of all other stacks.

As of patch 2.6.1, this effect can increase speed above the usual +25% limit.

Consuming a corpse contributes to this effect when done by either Corpse skill (, Devour, or Corpse Lance) or by the Decay Golem.