Something has gone deeply wrong in the world of Aden. A catastrophe known as the Darkfall has begun seeping across the land, spawning mindless creatures called nocturnals that terrorize every corner of the realm. Battle-hardened warriors ride out to meet the hordes in open combat, while rogues and inquisitors root out traitors hiding within the walls of corrupted cities. Mechamages bring devastating inventions to the fight — engines of steam fused with powerful magic. But none of it may be enough unless someone steps up to lead the charge against the darkness.