The material below is Open Game Content from a 3PP Source
Aura moderate evocation [evil]; CL 9th
Slot none; Price 60,000 gp; Weight 5 lbs.
This skull, carved from ebony, is wholly evil. Wherever the skull goes, the area around it is treated as though an unhallow spell had been cast with the skull as the touched point of origin. Each darkskull has a single spell effect tied to it. This spell is from the standard list given in the unhallow spell description, and it cannot be changed.
Requirements Craft Wondrous Item, unhallow, creator must be evil; Cost 30,000 gp