Seraphina (セラフィナ, Serafina?) was the older sister of Unity who was close friend of him and Dégel when they were young. Some years later, she became ill and died. Devastated by his sister's death, Unity decided to use her body as a vessel for Poseidon's soul so he could be free through her and make Bluegrad a prosperous place. Her body was successfully possessed by Poseidon and manifested his powers despite not seeming to have a conscience. In order to stop Poseidon, Dégel locked himself alongside Seraphina and the city of Atlantis inside his ice.