The Seminal Catastrophe − Gravenstafel is a strategy card game for 2 players. The game takes place at The Second battle of Ypres during The First World War. This battle marked the first mass use of chlorine gas on the Western Front. Will you play as the attacking force of Germany, or will you choose the opposing British and French forces? Don't forget to keep track of your resources and watch out for those poisonous gas clouds as you charge the enemy lines!