Tiamat Beast is a major antagonist in the Fate/Grand Order: Absolute Demonic Front - Babylonia chapter. She is an ancient Mesopotamian goddess and one of the Seven Beasts, embodying the concept of 'Mother of Monsters.' As the primordial mother, she seeks to reclaim the world for her children, causing destruction and chaos. Her overwhelming power and tragic nature make her a formidable foe and a central figure in the story's dramatic climax.