Defend the Citadel of Modhelm! Dark forces have surrounded the great city and the entire realm will drown in flames if the Abyssal Hordes aren't stopped! The Council has tasked a Messenger with escaping the siege to retrieve an ancient, magic artifact that will break the enemy forces. The Citadel must endure the onslaught until the Messenger returns - and it falls to the Heroes to defend it! Fight back the encroaching Abyssal Hordes until salvation arrives in B-Sieged: Sons of the Abyss, a fully cooperative castle defense board game.