Besieger introduces a world filled with feudal rivalry in which players can wage war as either Viking or Cimmerian warriors. Contenders can build flying vehicles for combat or siege towns on horseback in an effort to conquer factions such as Ogres, Werewolves, Centaurs, and other non-human races. The armored walls of a barricade can be shattered using a battering ram and competitors can pocket enemy buildings and equipment. Players can also retreat and accumulate forces behind their own armored citadel for a counterattack.