The title of this article is conjectural. Although it is based on canonical information, the actual name of this subject is pure conjecture. It may be supplanted at any time by additional information released from canonical sources.
Tōtōsai's house is on a volcanic mountain. The house itself is a skull of a giant unknown demon. It is where Tōtōsai lives and works as a swordsmith along with his flying ox Mō-Mō. Humans are unable to venture there due to the harsh conditions. Both Inuyasha and Sesshōmaru come here when they want help from Tōtōsai. Sesshōmaru had blasted a hole on the roof of Tōtōsai's home when Tōtōsai had put a " Moving" sign up when he knew he was looking for him after his encounter with Shishinki.