Kastor takes the lead as he dives deep into the territory of Poseidon's realm as a Mollusca Cephalopoda of Octopodidae from the Animalia. He dives, and dives, and dives, eventually finding something ancient and having to prove himself. Aside from that, the party also finds something new when they meet Aithan again, and Kyriaki spots a new species of demon as it stalks them...