A devoted priest of the Orthodox Church serves the Lord of Radiance, supreme among the Nine True Gods. Following a raid on a forbidden cult's descent ritual, the priests capture a corrupted puppet—a vessel touched by an outer evil god. Escorted by Tribunal knights aboard a steam locomotive, the priest must transport the tainted artifact to the cathedral. Their path leads through Yellow Valley Town. Then catastrophe strikes without warning—an explosion tears through the train. December 13th, 837 A.D.: starlight cascades across the world as the imprisoned evil god's consciousness erupts from the puppet's shell. This day would become known eternally as the "Day of Divine Descent."