Dead Man's Hat

This helmet increases by 2 the DC of all Necromancy school spells cast by the wearer. The wearer temporary becomes an undead creature, and is cured by negative energy, while being damaged by positive energy. Spells and abilities affect the wearer as an undead creature. Wearer's health is calculated based on Charisma, and the wearer acquires all the immunities inherent to an undead creature.