History of Revenant Empowerment

Revenant Empowerment is the status in Kell's Fall gained by collecting ten stacks of Revenant Essence. It lets you damage otherwise immune bosses and enemies, such as Kaniks and Fikrul, in the material plane (per Destinypedia and DualShockers). The sources differ slightly on how Essence is gathered (45-second stacks versus motes dropped by Weavers).