Yōreitaisei

was a yōkai hermit who taught Inuyasha about absorption of Yōki and how to keep control over it.

History
With Tessaiga's new form, the Dragon-scaled Tessaiga, Tōtōsai sent Inuyasha to him to train so he could use it without it backfiring. Mō-Mō lead Inuyasha and his friends to the village where the demon hermit resided. When Inuyasha reached said village, he underwent a tricky test with which was helping Inuyasha to discover the existence of whirlpools of demonic energy, Yōki, that he could cut through with his Tessaiga now to defeat his enemies.

Trivia

 * His seiyū, Ichirō Nagai, voiced several characters from Rumiko Takahashi's previous series. They include Cherry and Sakura's Mother from ', Happosai from ', and Coach Mukoda from .

Media appearances
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Manga

 * Chapter 426
 * Chapter 427
 * Chapter 428
 * Chapter 429
 * Chapter 430
 * Chapter 431

Anime
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 * Episode 5 (FA)

Yōreitaisei Yoreitaisei 妖灵大圣