In B-Sieged: Sons of the Abyss, players must cooperate to defend the Citadel of Modhelm. Dark forces have surrounded the Citadel, and the entire realm will drown in flames if the Abyssal Hordes aren't stopped! Even the fearsome Avatar of Destruction is with them and is capable of destroying the whole Citadel by itself if the Walls are reached! The Messenger escaped the siege to retrieve an ancient magic artifact that will break the enemy forces. The Heroes must repel the attackers, fighting them from the Walls and firing the mighty Catapult that sits at the center of the Citadel. To do so, they must equip themselves for the siege, fixing damaged parts of the Citadel and gathering food to keep people from starving during the long battle!