For nine hundred generations, the city of Deepgate has hung suspended by giant chains over a seemingly bottomless abyss. In the unfathomable darkness below is said to reside the dread god Ulcis, `hoarder of souls', with his army of ghosts. Outside the city extend the barren wastes of Deadsands, inhabited by the enemy Heshette, so that safe access is guaranteed only by a fleet of airships.

At the hub of the city itself rises the Temple, in one of whose many crumbling spires resides a youthful angel, Dill, the last of his line. Descendant of heroic battle-archons, yet barely able to wield the great sword he has inherited from his forebears, he lives a sheltered existence under the watchful eye of Presbyter Sypes, who rules the Temple. For despite his sense of purposelessness, Dill has a destiny about to unfold - one that will take him down into terrifying depths of the pit in a desperate quest to save the teeming but precarious city from total annihilation at the hands of a cunning and resourceful traitor.