The windigos are winter spirits that feed off fighting and hatred.

Princess Celestia and Princess Luna unleashed the Windigos upon Equestria to prevent Ponies from warring.

The Crystal Empire is located near the old Ponies homelands. They were able to stay because their love allowed them to resist the Windigo.

Queen Chrysalis was once Clover the Clever who had the love drained from her by a then weak Crystal Heart to try to kill all the Windigos.

Princess Celestia and Princess Luna didn't exist yet when Windigo tormented Equestria.

Windigo were created by Nightmare Moon.