Gakusanjin
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Gakusanjin is a character in the manga and anime series InuYasha. He first appears in chapter 336 of the original (Japanese) manga.
Gakusanjin is a mountain yōkai who used the Fuyōheki, a stone that masked the presence of yōki (yōkai energy), to pass unnoticed and avoid confrontations.
Circa chapter 335 his Fuyōheki was stolen by Naraku or his agents (possibly Hakudōshi). Now perceptible, Gakusanjin was forced to leave his usual resting place and move in an attempt to recover the Fuyōheki. He learned of Naraku from InuYasha's group and lent them yōki-imbued cristals that they could use to detect the proximity of the Fuyōheki.
He was shortly after killed by Goryomaru children protegés, who did not bother to investigate whether he was a hostile yōkai or not. His stolen Fuyōheki was given by Naraku himself to Akago in order to mask him (and Naraku's heart inside him) completely from Naraku's enemies. It was later absorbed (along with Akago himself) by Mōryōmaru.
The stone did not prevent a newly trained InuYasha from sensing Mōryōmaru's yōketsu, until Mōryōmaru absorbed Naraku and his portion of the Shikon jewel, increasing both Mōryōmaru's powers and the stone's. During the same battle, the Fuyōheki was destroyed when Miroku tried to suck Naraku and Mōryōmaru (now merged into one being), or at least Akago (which would have destroyed Naraku and Mōryōmaru as well) into his Kazaana. He failed, but the Kazaana's powers did manage to pull the stone away from them and into the Tunnel (along with vast quantities of shōki), thus destroying it.