Formaria – a labyrinthine network of underground tunnels – is home to the Fromryr. An alliance of humans, dwarves, elves, and gnomes, they fight an endless war with ancient technologies. Technologies they don’t truly understand but deploy with devastating effect.

Above the surface, exorcist Kalbrayeth Lyander investigates a possible demonic incursion. When he discovers a body imbued with unknown sorceries he finds himself in possession of a secret he never wanted. A secret that threatens to break centuries long alliances and drag Formaria into a war it cannot afford.

Below the surface, Brazier Veranquis, the First Officer of ice miner the Chalice of Amaranth, responds to a distress signal from an unidentified gyre ship. What he and his crew find leaves them fleeing for their lives. When their paths cross Lyander, they realise what they found threatens to bring down all of Formaria.

War is coming and with an enemy outmatching even the mighty Fromryr. Uncertain of who to trust and embroiled in political intrigue, Lyander and Brazier must do everything they can to prevent Formaria’s fall. The odds are against them. But in the abyss, one ship can change the fate of millions.