A new race called revenant. They can look like any other race but have their own bufss/debuffs.

Revenant: Revenants are people who have been stricken by the curse of revenancy. This gives them a sort-of immortality. When a revenant is killed then he/she will crumble into dust and have his/her body regenerated after some years. The time spent regenerating is half of the amount of time spent alive. A revenant that hasn't died for 20 years will regenerate in 10 years. When regenerated they will appear as if 12 years old. In mind however, they remember everything that has happened in the previous lives. In order to undo this curse, a revenant will have to fulfill a task given upon receiving the curse. Many revenants fail this task, and are driven to insanity through their incapability to die permanently.
Advantage: +1 accuracy with the melee. Disadvantage: -3 accuracy with firearms