In Egyptian mythology, the composite monster that devours the hearts of the unworthy in the afterlife is Ammit.
Ammit was depicted with the forequarters of a lion, the hindquarters of a hippopotamus, and the head of a crocodile. These were among ancient Egypt’s most feared dangerous animals, so the hybrid conveyed overwhelming destructive power. Her name means “Devourer of the Dead” or “Swallower of the Dead.”
In the Judgment of the Dead, the deceased’s heart was weighed against the feather of Ma’at, the principle and goddess of truth and cosmic order. Anubis supervised the scales, while Thoth recorded the result and Osiris presided over the judgment. Ammit waited nearby for those whose hearts failed the test.
A heart heavier than the feather signaled wrongdoing. Ammit would consume it, preventing the deceased from continuing toward the blessed afterlife of Aaru. This was not ordinary punishment or eternal torment: the person was effectively denied continued existence and left soulless in the underworld. Although often called a goddess, Ammit functioned primarily as a feared guardian demon and was not the focus of a regular cult.