Tales of the Northern March
Legendary magic staff
A rune-carved staff of black and twisted wood.
Property: You gain a +3 bonus to attack rolls and damage rolls you make with this staff. All damage done is necrotic and ignores resistance and immunities.
Property [Attuned]: You must be a cleric, a druid, or a wizard to become attuned to this item. The staff has 10 charges. When you hit with an attack using this staff, you can expend up to 3 charges. For each charge expended, the target of your attack takes 1d6 + 3 extra necrotic damage. If you expend the staff’s last charge, roll a d20. On a 1, the staff blackens and loses this property. The staff cannot regain charges and functions as a normal quarterstaff. The staff regains 1d6 + 4 expended charges each day at dusk.
Loki took a branch from a tree near the gate of Hel’s home and enchanted it to make this staff. It is said to be able to harm any creature, regardless of its usual ability to shrug off damage. It is said to be in the possession of Queen Sinmara of Muspelheim who keeps it in an iron box with nine locks.