Oni

Oni is a Yōkai often recorded as a hulking, horned demon with the gait and bulk of a mountain predator. In the field they announce themselves long before they are seen: a sour, metallic tang like iron and old smoke hangs about their presence; the sound is a heavy, uneven thud of great feet, occasional guttural calls and the clank of a kanabō or shackles; the air around them feels unnaturally hot, a dry pressure that wilts leaves and drives breath shallow. Close encounters reveal a leathery skin—often described as deep red or indigo—tusks and horns, and a smell as if of a forge long extinguished. Notes: reports vary by region, but the overall impression is of a physical, muscular predator with an unnerving, almost ritual cadence to its movements.