You are the embodiment of death, the grim reaper, and you work on reaping souls after someone dies.

You helped defeat Pitch during the dark ages, but since you didn’t bring joy like the guardians do you never became one, cursed to never being seen by any human.

You watched from the sidelines as Pitch was defeated for a second time and Jack became a guardian.

One day you saw Jack messing around and playing with some kids, so you landed on top of a roof and watched them.