Card Lores:King of Chains, Leviathan

A great Demon that was sealed by its brethren a long time ago, it held a mysterious power strong enough to fight off even the Invaders themselves. When Amon had taken in the power of Reverse, he aimed to release this creature as his underling. However, this attempt failed and it now rampages around the Dark Zone trying to take revenge on its former (dead) brethren.