Book of Vile Darkness 3.5
By Monte Cook
This piece of black granite, if used as an altar or part of an altar, can be commanded to absorb the soul of a victim sacrificed upon that altar. The soul is stored as if in a gem as a part of a Trap the Soul spell. It can be called forth and used in the various ways. A dark altar stone can store only one soul at a time.
Caster Level: 17th; Prerequisites: Craft Wondrous Item, Trap the Soul; Market Price: 150,000 gp;Weight: 100 lb.