Crown of Muspelheim

Passive Abilities
Gargantuan: This artifact is huge, only meant to be wielded by a Gargantuan figure.

Power Immune: The artifact is immune to all effects and powers not cast by the wielder. This doesn't extend immunity to the wielder. It cannot be broken, transported (seperately from the wielder), or altered by an opponent.

Soul-Bound: This artifact contains the essence and power of an individuals, allowing them to be resurrected through this artifact. However, this artifact requires that the person be carrying it for them to have a corporeal form. Without this person wielding the artifact, the artifact is inert. (Surtur)

Adjusting Charm: The artifact adjusts its size based on the user's stature. If combined with Soul-Bound, this occurs only when it is not in use by its binder.

Active Abilities
Restore Slots: You regain all missing spell slots as an action. You may only do this once until completing a long rest.