Heroes of the Dragonfall and the Ragewinter are summoned to meet King Belvor IV of Furyondy. He recruits them to his Retribution Crusade against the Empire of Iuz. After assembling a host of levied commoners, crusader knights, templars, a paynim tribal host, and battle mages of the Arcustodis they are ordered to lay siege to Castle Naelax, cursed seat of the Death Knight Thyrian.
Faced with a long siege or difficult preparations for an assault the heroes decided to attempt to take the gate house of the castle with a surprise attack. The gate house turned out to be better defended than expected and with the Castle roused the heroes are cut of from escape.