A petite old woman who commands the respect of the entire sect, being the Second Oyakume who maintains Hakumen no Mono's barrier prison.

Spoiler

She was the shaman who sealed the Gamin in the boxes long time ago. She has sacrificed herself by using all her psychic powers to kill one of the avatars of Hakumen no Mono that attacked the Kōhamei Sect headquarters.

(Source: Wikipedia)