Alf Seidr ("Elf Magic") is a form of peaceful magic that can only be wielded by some Elves and children of Frey as well as the god himself. Its main uses are for healing, growing and stopping violence. It cannot be learned, unlike rune magic. You either have Alf Seidr in your blood or you do not. It was first seen in The Sword of Summer.
Some powers that are gained from Alf Seidr include:
- Disarmament: The user can expel energy like the shockwave from a bomb, disarming anyone in his or her surrounding area of their weapons.
- Healing: The user can heal both him or herself and others from wounds at incredible rates.
- Alf Seidr is said to be lesser magic than Rune Magic.