From Pathfinder #182: Graveclaw, which isn't enabled.

Demilich Skull

HAZARD 8

Stealth +18 (expert)

Description The skull of a defeated demilich is haunted by souls of the demilich's victims.

Disable DC 26 Arcana, DC 26 Occultism, DC 26 Nature, or DC 26 Religion to counteract the skull's Broken Gems

Broken Gems (arcane)

Trigger A living creature approaches within 10 feet of the skull

Effect The spirits haunting the skull activate one of the skull's ruined gemstones, casting one of the following four spells determined randomly:

Cast into Time, DC 26 Fortitude
Chain Lightning, DC 26 basic Reflex (8d12 electricity damage)
Fireball (6th), DC 26 basic Reflex (12d6 fire damage)
Spellwrack, DC 26 Will (2d12 persistent force or 2*2d12 persistent force damage)

The saving throw DC for any spell is 26.

Reset 1 day

Pathfinder #182: GraveclawOGL