The Great Dog Demon
The Great Dog Demon (, Inu no Taisho) was a powerful demon lord who was known throughout Japan. He fathered two sons by two different mothers: Sesshomaru from Inukimi, a dog demoness, and InuYasha from a human woman named Izayoi.
His major foe was the dragon Ryūkotsusei, whom he could not kill but sealed onto a cliff face with his claw; after this battle he survives long enough to save Izayoi and their newborn child InuYasha. Still weak from his battle with Ryukotsusei, he dies defending them from a human foe.
The gateway to his tomb is hidden in a black pearl (a mystical gem that creates a path between the mortal and spirit worlds) inside InuYasha’s right eye. His body is shown as an enormous dog skeleton in a suit of armor. The sword Tetsusaiga, forged from the Great Dog Demon’s own fang, rests inside this cavernous skeleton, protected by a barrier that repels any non-human with malice toward humans. Because of this, InuYasha inherits the sword rather than Sesshomaru.