From Pathfinder Society Scenario #5-05: The Island of the Vibrant Dead, which isn't enabled.

Blazing Skull

CREATURE 3

Variant flaming skull

More dangerous than simple severed heads, these skulls are wreathed in unearthly flames.

Beheaded are the reanimated heads of decapitation victims. These mindless undead fly through the air or roll around to attack their prey.

Perception +11; darkvision

Languages Common, Necril

Skills Acrobatics +10 (+12 to Maneuver in Flight)

Str +1, Dex +4, Con +1, Int -5, Wis +3, Cha +0

AC 20; Fort +7, Ref +12, Will +9

HP 45, void healing; Immunities bleed, death effects, disease, fire, mental, paralyzed, poison, unconscious; Weaknesses vitality 3

Fiery Explosion

When destroyed, a blazing skull explodes in a blast of fire and bone that deals 1d6 piercing damage plus 1d6 fire damage to each adjacent creature (DC 20 basic Reflex save).

Void Healing

A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead.

Speed 15 feet, fly 30 feet

Melee Forehead +12 (finesse), Damage 1d6+5 bludgeoning plus 1d6+2 fire

Melee Spitfire +12 (agile, fire), Damage 1d12+4 fire

Flaming Shroud

A flaming skull is shrouded in hideous flames. It deals 1d6 fire damage to any unattended item it touches and on a forehead Strike. On a critical hit with a Strike, the target catches fire, taking 1d4 persistent fire.

Pathfinder Society Scenario #5-05: The Island of the Vibrant DeadOGL