Kasuga Keita was a shabby little merchant of the Tortoise Clan. In 1165 at Otosan Uchi Kasuga gave a heavy sack with jade to a masked man, Seppun Jin. The Tortoise did not know he was a bloodspeaker, and was killed by Jin's yojimbo, the undead Voitagi. Jin used the blood to create obsidian tainting the jade he got.