The vast Siren Sea extends west from the known lands of Theros to the edge of the world. As Thassa’s domain, the sea hides an amazing array of creatures, including the entire triton civilization. Its legendary dangers range from deadly reefs and wandering islands to predatory beasts and devastating krakens (see chapter 6). Ever-changing, the Siren Sea is a realm of impossible sights and constant danger, the setting of legendary odysseys and the crucible of heroes.
Tritons of the Siren Sea
Most tritons make their homes in the Siren Sea, either migrating with the shifting tides or raising hidden cities of outlandish beauty. The majority are devoted servants of Thassa who rigorously protect her domain, often treating surface-dwelling sailors as trespassers. Tritons make most of their goods from materials harvested from the deep, but have also developed ingenious forms of metallurgy—largely based around volcanic sea vents—and chemical etching, crafting wares that rival those made on land. The endless array of life and unpredictable changes of the sea make tritons regular witnesses to wonders. As a result, most tritons have a natural curiosity, ever seeking to see and learn more, but know they’ll never fathom all the wonders of the world.
Although numerous triton cultures exist throughout the Siren Sea, many of those closest to shore are led by priests of Thassa. Triton warriors enact their leaders’ will, with many specializing in doing battle against massive beasts or ships sailing the surface. The most wary communities might even employ shorethieves, tritons adept at using magical disguises to infiltrate land-bound towns to watch and steal from “dryfolk.”
Dakra Isles
The Dakra Isles were created when Thassa wept over the death of Korinna, a triton queen killed by a human’s harpoon. Where the god’s tears fell onto the sea there exploded forth an isle suffused with immortal magic and memory. Ages later, the Dakra Isles—also called the Isles of Enchantment—harbor strange sights and fierce monsters. Thassa’s power makes it impossible to keep an accurate chart of the islands’ positions, which roam as they please. Thus, even the most famed locations appear on no map, and sailors might spot them when or wherever Thassa wills. A few of the Dakra Isles’ legendary locations are noted here, and chapter 4 presents guidance for creating more magical shores.
Arixmethes
Tales tell of the lost island of Arixmethes, whose population was wiped out by disaster. In truth, generations of hapless humans raised their city, realizing too late that they’d done so upon the back of a titanic kraken. When the kraken Arixmethes awakened, its throes devastated the city upon its back and wiped out the residents. Since returning to its slumber, Arixmethes drifts where it will, still bearing the ruins of a legendary city upon its back.
Cronemouth Cove
This tiny island lies in the midst of perpetual doldrums and holds a known gate to the Underworld. It is guarded by a coven of sea hags who share a single tongue that is perpetually trying to escape from their clutches, wriggling out of reach with a mind of its own.
Ketaphos
Famed for its role in The Callapheia, the island of Ketaphos supposedly exists in Nyx during the night and in the mortal realm during the day. Callaphe and her crew were welcomed there and fed by a band of Nyxborn centaurs when a storm drove them to the island, then found themselves stranded on a barren rock when the sun rose and the island shifted to the mortal realm.
Skathos
The island of Skathos was once a sacred meeting place for a secret cult of Pharika whose rites revolved around consuming a magical flower native to the island. The island is now home to the medusa queen, Hythonia.
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