The flameskull is a 5th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 13 +5 1d20+5 to hit with spell attacks). It requires no somatic or material components to cast its spells. The flameskull has the following wizard spells prepared:   Cantrip (at will): Mage Hand   1st Level (3 slots): Magic Missile, Shield   2nd Level (2 slots): Blur, Flaming Sphere   3rd Level (1 slot): Fireball

Illumination. The flameskull sheds either dim light in a 15-foot radius or bright light in a 15-foot radius and dim light for an additional 15 feet. It can switch between the options as an action.   Magic Resistance. The flameskull has advantage on saving throws against spells and other magical effects.   Rejuvenation. If the flameskull is destroyed, it regains all its hit points in 1 hour unless holy water is sprinkled on its remains or a Dispel Magic or Remove Curse spell is cast on them.