The Fisherman Who Rules the Sea

When a volcanic eruption breaks the seal holding the Titan beast, Prince Eurymedon witnesses a humble fisherman named Glaucus summon a sea monster to reseal it—and discovers he is actually the missing sea god Poseidon, whose son Aegeus serves in the capital legion unaware of his father's identity. After enduring humiliation at the Festival of Dionysus and facing a Titan-powered rampage and shattered seal, Glaucus slays the Titans before the people.