Head Sense. Black smoke billows from zombie roggvir's neck, he can magically sense heads within 10 feet of him. He can take the head of any humanoid corpse using his action, wearing the head for his own. While wearing a humanoid creatures head, he gains 60 feet of darkvision and his Wisdom scrore increases by 10. Zombie roggvir's head can be removed by a disarming attack.   Headless. While zombie roggvir is without a head, he is Blinded (condition) and Deafened (condition).   Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.