Throe-Heart of the Unbound Succubus

This amulet consists of a pulsating, fist-sized ruby encased in a jagged cage of black iron that seems to drip shadow. The ruby is not a gemstone, but a calcified heart that still beats with a frantic, irregular rhythm. When held, it feels uncomfortably warm and vibrates against the palm, emitting a faint, rhythmic sound like a distant party and a dying scream layered together.