OGC:Sentinel Stone, Greater (3.5e Equipment)
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Greater Sentinel Stone
A greater sentinel stone is identical to a sentinel stone, only the effects are far more severe. If the victim of the stone intentionally deviates from the course of action set by the stone, she must make a Will save (DC 20); if she fails, she is immediately slain. If she makes the save, she still suffers 3d6 + 15 points of damage. The precise nature of the attack will vary based on the creator of the stone; the victim’s body may be consumed by flames, she could rot away from the inside out, or she might simply drop dead with no apparent injuries whatsoever.
Strong Enchantment and Necromancy; CL 15; Create Wondrous Item, geas/quest, destruction or finger of death; Market Price: 150,000 gp