Armor Class 13
Hit Points 40 (9d4 + 18)
Speed 5 ft., fly 40 ft.
Skills Arcana +5, Perception +2
Damage Immunities fire, necrotic, poison
Condition Immunities charmed, exhaustion, frightened, paralyzed, poisoned, prone
Senses Darkvision 60 ft., passive Perception 12
Languages Common plus two other languages
Challenge 4
Illumination. The flameskull sheds Bright Light in a 15-foot radius and Dim Light for an additional 15 feet.
Magic Resistance. The flameskull has Advantage on saving throws against spells and other magical effects.
Undead Restoration. If the flameskull is destroyed, it regains all its Hit Points in 1 hour unless Holy Water is sprinkled on its remains or the Dispel Evil and Good spell is cast on them.
Multiattack. The flameskull makes two Fire Ray attacks.
Fire Ray. m,r +5, reach 5 ft. or range 60 ft. Hit: 13 (3d6 + 3) Fire damage.
Monster Manual (2024), p. 120