After a horrible incident known as the Great Hall Tragedy, the continent of Atlatan is once again ravaged by the fires of war. The marriage of Sir Alexis Douse and Lady Marrine Kreische, which was meant to be a joyous occasion that would bring peace between the Fantasia Union and the Factory Alliance, turned out to be a tragedy. The ceremony was abruptly interrupted as the bride and groom came down the aisle by a strong confluence of "Chaos," an evil force from another dimension that corrupts the land and introduces monsters and demons into the planet. The Demon Lord of Diabolos arose from within that energy, a malevolent creature that swiftly slaughtered the archdukes of both groups, crushing all prospect for peace between them.