SESSHOSEKI

Lore

Sesshoseki, or the "Killing Stone," is a cursed object that serves as a spiritual prison for an extraordinarily powerful and malicious being. Its name comes from its ability to kill any living creature that draws near or touches the boulder's surface. The danger is twofold: first, the physical stone, saturated with negative energy; second, the spirit sealed inside it, believed to be the legendary nine-tailed fox Tamamo-no-Mae.

Folklore says that after this fox died, her body turned to stone, and her vengeful spirit, Hoji, fused with the rock forever, turning it into a source of ceaseless malevolent energy known as jaki. The stone sits in the volcanic region of Nasu, Tochigi Prefecture, at the foot of Mount Chausu, near the Nasu-Yumoto hot springs. This location is traditionally viewed as a thin point between the mortal world and the realm of the dead.

The local geology amplifies the threat: cracks in the rock constantly vent hydrogen sulfide and sulfur dioxide, accounting for the deadly fumes around the boulder. Legend treats these gases as the tangible form of the poison the demon continues to spew even after death. A barren field stretches around Sesshoseki, where birds are said to fall dead from the sky if they fly too close to the toxic, spirit-infused vapors.

For centuries, the stone has been kept under ritual guard. A sacred shimenawa rope is traditionally strung around it, meant both to contain the evil power and to warn travelers of the mortal danger. While the physical stone reportedly split in two in recent years, local tradition maintains that the spirit within remains as potent and perilous as ever, demanding respect and caution from all who visit the volcanic slopes.