The Cricket Ball of Magic, also known as Deus Ex Cricket Ball, was an informal name given to a magic stone the size of a cricket ball which played a major role in the Great War. The stone was an ancient Lefein artifact which held the power to nullify the power of magical items such as the shards of Krystallopyr. Distreyd Thanadar XII, High Cleric of Mardük, was using a particularly large shard of Krystallopyr to cast the Plague of Nightmares all around the world, which helped the army of Yamato Empire conquer the neighbouring kingdoms. It was thus important for the Grand Alliance to find a way to put an end to the nightmares by using the stone in order to stand a chance against Distreyd and his forces.