Benthica is the underworld’s most prestigious seafood restaurant. It is located on the opposite side of the planet’s surface from the Marianas Trench, and is constructed from bricks of black water that have crystallized from the sheer pressure of the ocean’s depths. Strange, luminous creatures can be seen swimming through walls that are otherwise solid for everyone else present. Among them is the nameless child of Hades and Charybdis, who is prophesied to someday be the death of Poseidon.