Hōsenki I

is an oyster-demon who cultivates a variety of magical jewels.

History
Hōsenki created the Black Pearl in Inuyasha's right eye that enabled Sesshōmaru to travel to his father's grave and try to steal Tessaiga, the sword his father willed to Inuyasha. When the Shikon no Tama was split into many shards, one came into Hosenki's possession as his life was coming to an end.

During the Story
Inuyasha's group needs to travel to the nether world and seek out Hōsenki, but learned he passed away and his son, who shares his name, can not make the gems yet. They found another path to the world where they find the departed Hōsenki sitting among the bone's of Inuyasha's father's body with the last shard of the jewel. Hosenki refused to give Inuyasha the shard. He said that the shard could speak to him, and that it did not want to merge with the rest of the jewel or else it would become corrupt. Hosenki soon became attacked Inuyasha. After Naraku reclaimed his shard, Hōsenki returned to normal and allowed Inuyasha's Tessaiga's to learn his Kongōsōha attack.

Inuyasha was able to obtain the shard from Naraku after Kagome damaged Naraku's body. Hosenki allowed Inuyasha to keep the shard and warned him to leave before he would get trapped in the netherworld forever.

Powers & Abilities
Hōsenki's power can be theorized to be comparable to Naraku's, as Naraku himself stated that, as long Hōsenki's shard was protected by both his adamant armor and demonic power, it was "even beyond my reach". It was only by corrupting the shard and manipulating Hōsenki into attacking Inuyasha that Naraku was able to weaken Hōsenki enough to allow his jewel shard to be stolen.
 * Kongōsōha: Hōsenki is the original wielder of this powerful technique. He is able to send a shower of adamant shards (diamonds) to injure his enemies. It is powerful enough to penetrate Naraku's stronger barrier and it is the only technique that is able to do so. It is also powerful enough to destroy large parts of the cliffs that surround the border between the living world and the afterlife.
 * Adamant Armor: Hōsenki is covered in adamant and because of that he has an incredible defense due to adamant being considered the strongest substance in the world. His defenses are able to withstand Inuyasha's Kaze no Kizu and repeated blows from Inuyasha's Tessaiga without much trouble. His defenses can still be breached, as they were by Naraku, because the corruption caused by his darkened shard had weakened him (Hōsenki) greatly.
 * Super Strength: He is powerful enough to hit Inuyasha and send him flying. After the hit Inuyasha lost consciousness for a short amount of time. Even after being weakened by both the corrupted shard and his internecine battle with Inuyasha, Hōsenki is still capable of ramming an adamant arm straight through both Naraku's previously unbreakable barrier and his body, though his defiance was in vain.

Hōsenki Hozenki 宝仙鬼