Ammut

Ammit
Ammit was a female demon in ancient Egyptian Religion with a body that was part lion, hippo and crocodile—the three largest "man-eating" animals known to ancient Egyptians. A funerary deity, her titles included "Devourer of    the Dead", "Eater of Hearts", and "Great of Death".

Egyptian Mythology
Ammit lived near the scales of justice in Duat, the Egyptian underworld. In the Hall of Two Truths, Anubis weighed the heart of a person against the feather of Ma'at, the goddess of truth, which was depicted as an ostrich feather (the feather was often pictured in Ma'at's headdress). If the heart was judged to be not pure, Ammit would devour it, and the person undergoing judgement was not allowed to continue their voyage towards Osiris and immortality. Once Ammit swallowed the heart, the soul was believed to become restless forever; this was called "to die a second time". Ammit was also sometimes said to stand by a lake of fire. In some traditions, the unworthy hearts were cast into the fiery lake to be destroyed.

Ammit was not worshipped; instead she embodied all that the Egyptians feared, threatening to bind them to eternal restlessness if they did not follow the principle of Ma'at.

Ammit has been linked with the goddess Tawaret, who has a similar physical appearance and, as a companion of Bes, also protected others from evil. Other authors have noted that Ammit's lion characteristics, and the lake of fire, may be pointers to a connection with the goddess Sekhmet. The relation to afterlife punishment and lake of fire location are also shared with the baboon deity Babi.

Relation to the Show
The newly awakened evil Robert Frobisher-Smythe is trying to awaken Ammit. Robert said that Ammit longed to walk through the earthly realm. To awaken Ammit, She needs to eat the souls of five sinners with five sins such as greed, anger, spite, jealousy, and pride. Robert was assigned to do this job with the help of Caroline Denby and the soul-less Victor. There are 5 Sarcophigi to host the fve sinners. They could only be captured at noon or midnight and they should exposed this sin while being captured as shown when Victor admitted he had greed therefore, showing it, the sarcophigi opened and captured him making him the first sinner. After being captured, Victor turned into a soul-less servant to Robert. It is shown in Eddie's vision that Patricia may be the second sinner to be captured.