Burning Skull Mace

Weapon (mace), very rare (requires attunement)

This heavy mace is made from a troll’s skull and it flames automatically when grasped and wielded. You gain a +1 bonus to attack and damage with this magic weapon, and it deals an additional 1d6 fire damage with each hit. The wielder can command the skull to float off the mace’s haft and attack on its own as a spiritual weapon for 1 minute, with an attack bonus equal to the wielder’s proficiency bonus +3. The skull is immune to all damage while it is animated. Each successful hit by the animated skull deals 1d8+5 points of damage plus 1d6 points of fire damage. While the skull is detached, the haft can be wielded as a +1 mace. Once animated, the skull cannot be animated again until the next dawn.