Also known as "Lapis Upirenke". This artifact was created by Ambrosia and separated from him when he was banished to the demon realm. He needs this gem to help siphon the souls in the Tangiers Stone and resurrect his body. It is a powerful gem that is spiritually adept and capable of various abnormal feats. Depending on the heart of the user, it can release holy or evil energies. Amakusa initially steals it to bolster Ambrosia's resurrection though he also uses it to perform various forbidden arcane arts, most of which includes defaming the shogunate by destroying his castles. By contrast, Tam Tam used it once in the past to heal his sick village.