Úlfhéðinn

Passive: After melee combat (either when attacking or when targeted), if Úlfhéðinn survives the attack, reduce Úlfhéðinn’s health to 1.

Regenerate: The unit heals 1 damage at the start of your turn.

Úlfhéðinn, was a term used interchangeably with Berserkr. After battle, they would be exhausted and require great rest to recover.