Sirens possess an otherworldly beauty, with skin that shimmers like moonlight on the ocean's surface, in hues of deep sea green, silver, and shadowy blue. Their long hair flows like kelp in the currents, often adorned with pearls or fragments of shipwrecks. Their eyes are pools of fathomless ocean, glowing with an eerie light—those who gaze into them feel a pull toward the abyss. Their bodies are graceful and slender, crafted to move with the fluidity of the sea, and their voices—an irresistible lure—can break the hearts of those who hear them. Sirens are typically around 160-175 cm, with an ethereal, haunting presence that makes them appear both part of the sea and yet above it. 

The Sirens of Elyria dwell on the most perilous coasts and in deep oceanic trenches, where the sea is unforgiving and treacherous. Their islands are isolated, surrounded by jagged reefs, powerful whirlpools, and storms that seem to manifest at their command. These islands are hidden under thick mists, impossible to approach without the guidance of a Siren’s song. While their homes are perched atop sea cliffs or nestled in ocean caves, their true dominion lies beneath the waves, where they claim the souls of the sailors who wander too close. The depths are where their connection to Dagon, the dark god of the seas, is strongest, and where they can freely harvest the life essence of those lost to the deep. 

Sirens live for centuries, though their life force is tied to the souls they consume. Each soul taken grants them extended vitality, but the more they feed, the more they are marked by Dagon's influence. A Siren’s lifespan can reach over 200 years, though many fall into madness or corruption if they consume too many souls at once. Their power grows with each soul they take, but it also strengthens their bond to Dagon, making them more dangerous and unpredictable. They are tied to the rhythms of the ocean and the cycles of the moon, and their longevity is only disrupted when their song is silenced or they stray too far from the water. 

The Sirens worship Dagon, the dark god of the seas, believing him to be the source of their power, their song, and their unending hunger. They see the ocean as Dagon's domain, a realm of mystery, death, and rebirth. To the Sirens, drowning sailors are not just prey, but offerings to Dagon, whose power grows with each soul consumed. Their faith is built around rituals of sacrifice, with each song sung a prayer for strength and each soul stolen a blessing from Dagon himself.

The Sirens’ songs are believed to carry Dagon's will, calling those destined to die in the depths. The more beautiful and haunting the song, the closer they are to their god’s favor. Some ancient Sirens speak of the Song of the Abyss, a forbidden melody that can summon Dagon's true power, allowing the Sirens to call forth storms, sink entire fleets, and flood coastal cities in his name. This song, however, is dangerous and unpredictable—those who attempt to sing it are often lost to the sea or driven mad by Dagon’s overwhelming presence.

Necromancy, in Siren culture, is not solely for raising the dead but for harvesting the essence of the departed. Sirens do not reanimate the bodies they claim but rather consume their spiritual essence, feeding on fragments of the soul. Those souls that are consumed by a Siren are said to be added to Dagon’s endless hunger, strengthening both the Siren and the god.

Sirens live in tight-knit, matriarchal communities centered around powerful Songweavers, the eldest and most skilled among them, who are seen as the direct vessels of Dagon’s will. These Songweavers are responsible for teaching the younger Sirens the ancient hymns of the sea, songs that can manipulate emotions, summon storms, and control the tides. While Siren society is built on respect for the Songweavers, it is also heavily focused on the hunt for souls. The Sirens' primary function is not to protect the seas but to feed from it, drawing in sailors, adventurers, and ships to be consumed by the waves.

While Sirens do not often interact with outsiders willingly, their songs are sometimes heard from a distance by those who venture too close. These encounters are rarely beneficial, as the Sirens' songs cloud the minds of sailors, drawing them to their doom. The souls of the drowned are taken in ritualistic feasts, where the Sirens draw power from their sacrifices and offer prayers to Dagon.

Siren settlements blend seamlessly with the natural beauty of their coastal environments. Their homes are built from living coral, sea glass, and enchanted stone, designed to be both beautiful and functional for those who dwell between land and water. The structures curve with the flow of the ocean, often resembling shells or water lilies in shape. Great amphitheaters, carved from stone cliffs or shaped from coral reefs, are used for rituals and gatherings, where the Sirens sing their prayers to Dagon, calling upon the tides and the winds. In these sacred spaces, the ocean itself seems to respond, waves crashing in rhythm with the songs, sometimes even pulling offerings from the shore into the depths. 

While Sirens do not trade in material wealth, they do possess powerful and valuable magic—songs that can control the elements, bend the will of men, and command the tides. Their primary "trade" is their ability to provide magical services, such as guiding ships through treacherous waters, summoning storms, or aiding pirates with safe passage. However, their offerings come at a price: the soul of the sailor, merchant, or adventurer who seeks their aid. These souls are consumed as payment, absorbed into Dagon's endless hunger, fueling the Siren’s power.

The treasures they collect—rich pearls, enchanted trinkets from sunken ships, and rare oceanic gemstones—are kept hidden, as Sirens rarely see the need for material wealth. However, in some rare instances, these treasures may be exchanged in return for more souls or in rituals to gain favor from Dagon.

The Sirens do not practice slavery in the traditional sense. Instead, they view those who fall under their spell as either sacrifices to Dagon or as prisoners of the deep. Sailors who manage to survive their encounter with the Sirens, or who show unusual resilience against their magic, are sometimes kept alive, though their minds are often shattered, and they are rendered subservient to the will of the Sirens. These "captives" are kept in the Sirens' lairs, where they are either used in rituals or allowed to roam the islands, always under the control of the Siren’s song.