Umi no Triton EP23 - The Battle in the Fossil Forest

When Triton reads the notes Heptapoda has left behind, he learns that an immortal fish called Rakan has been living off the Coast of Madagascar Island since ancient times. Triton meets Rakan, who tells him that the Triton family had hardly any weapons when the Poseidon Family destroyed them. Triton's anger at the Poseidon family is fueled again when the Seinus Army of sea centipedes attacks.