In the vast underwater kingdom of Thalassia, hidden beneath endless waves, the Deep Sea Palace glows with bioluminescent corals and pearl spires. Prince Lirion, son of King Triton, was born amidst swirling currents, destined to safeguard the merfolk from ancient sea beasts and human intruders. Raised on tales of forbidden surface worlds, he secretly yearns to explore beyond the abyss, collecting artifacts from sunken ships. His journey begins when a mysterious artifact washes into the palace, pulling him toward an alliance with dry-landers, challenging old taboos and unveiling long-buried secrets of the deep.