"Well, first, you can clean the temple top to bottom for me."
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Musō (無双) was Naraku's seventh incarnation, and was ultimately the reincarnation of Naraku's human core, Onigumo.
During the story
He was the seventh detachment of Naraku. Naraku cared so little for this incarnation that he gives it no name or face; Musō takes both of those for himself from a wandering monk that he kills. Musō ventures to Kikyō's former village, where he runs into Inuyasha's group and battles them quickly after their encounter. Soon Naraku quickly realizes, however, that he cannot abandon Onigumo when demons try to gain their freedom from his body, and Musō is absorbed back into Naraku.
Faceless Musō
Musō had the form of a faceless man with a spider scar on his back. He is faceless because Onigumo was badly burnt before becoming Naraku, even his face was burnt off. Therefore Musō receives the same outcome. He goes around killing many people to take their face, eventually ending up with the face of the monk Musō (which is where his name came from). When he comes across Inuyasha and the gang, he seems to be immune to their attacks and is even able to regenerate himself after being torn to pieces by the Tessaiga.
Soon after, Naraku re-absorbs Musō since he feels that he has not gotten completely rid of Onigumo; possibly the threat of his death. He decides to try again later when he is stronger.
Meeting Naraku
The poisonous insects take Musō to nearby forest where Naraku is waiting. For the first time ever Naraku and Onigumo come face to face with each other. In the manga Musō instantly attacks Naraku and is absorbed almost immediately. The anime goes into further detail with the encounter. Naraku tells Musō that Kikyō is alive again and she is as he remembers her. Before he can question Naraku about Kikyō, Inuyasha and Miroku appear. As Inuyasha starts a fight with Naraku, Musō runs away. Still angry at Naraku for his imprisonment he decides to go back to kill Naraku. He stabs Naraku in chest, however doing this allows Naraku to reabsorb him. Naraku revealed that he still needed Onigumo's heart as a connector for his body, which was why he needed to reabsorb him.
Reuniting with Naraku
Naraku absorbing Musō
Realizing he was not yet ready to part with Onigumo's soul, Naraku confronted Musō and tried to absorb him back into his body. Inuyasha interfered, enabling Musō to run, but he foolishly went back to kill Naraku for revenge. Musō impaled Naraku but Naraku drew him in and absorbed him as he screamed for Kikyō, Kagura looking on as she thought, "If I'm not careful, that will be my ultimate fate..."
Powers & Abilities
- Facial theft - Having been created without a face, Musō can take on facial identities of others by apply faces to his head after ripping them off.
- Regeneration - Musō demonstrated infuriatingly powerful regenerative abilities, able to piece himself back together even after taking the Wind Scar from Inuyasha. However, had his heart been destroyed, not only his but Naraku's downfalls would have been assured. He also demonstrated the ability to regenerate and shapeshift new limbs, spikes, multiple legs and arms, claws, and a tail.