The Potion of Immortality is an artifact in Heroes of Might and Magic IV. If a hero that drinks this potion, dies during a battle, they gets resurrected but loses all spell effects. The potion of immortality provides only one resurrection, but can be used more than once during a battle. It remains effective until the hero dies, not just for one combat like other potions. This is a limited version of the Guardian Angel spell. The Potion of Immortality can be used both in combat and on the adventure map.