Bast is an old god in the myth of Cthulhu created by the American novelist Howard Philip Lovecraft. Created by Robert Bullock, it is a human woman with a cat head, and the prototype is the cat god in the ancient Egyptian mythology, Bast.

"The huge blind thing rustled out of the hole in the dark and seized Malcolm, who was still lying on the altar. It seized him with its cruel claws and nibbled at his throat. It was a corpse eater. It was ten feet high and squatted on the altar - like a mocking person, like a lioness creature painted on the wall. It was a huge human shape, but! That head!... It was Buba who killed him The Owl Goddess of Stis! "
——Robert Bullock, The Blood of Bubastis

The cat goddess Baste, also known as Bastet and Ubasti, occupies a seat among the important gods in the Cthulhu myth. She usually has two forms: either a cat or a female figure with a cat's head. In ancient Egypt, she is usually depicted as a goddess holding a shield with a lion's head in her left hand, a fork bell in her right hand, and a small bag on her left shoulder. She is considered the queen of all cats on Earth, Saturn, Jupiter and Uranus.
Like other old gods, Pasteur rarely participated in earthly affairs. But if someone is unusually cruel to cats, she will punish him through her subjects cats; She would never intervene unless the cats were helpless. When she decides to show up in person, beautiful cat attendants will accompany her - mainly domestic cats, but including at least one female lion, female tiger, or other large cats.

The prototype of Buster is the cat goddess Bastet in ancient Egyptian mythology. Among Cthulhu's mythological works, Bast first appeared in Robert Bullock's work The Suicide in the Study in 1935. Although there was a description of the deity in Lovecraft's work A Dream in the Study completed in 1927, The Suicide in the Study was Bast's first appearance because the work was not published until 1943. In Brock's works, Pasteur is described as a bloodthirsty evil god who feeds on fresh human corpses. In the era under the rule of the Black Pharaoh, Bast, Nayaratotyp and Seebeck together became the object of sacrifice, and she was believed by humans and ghouls. She was called "corpse chewer" by believers.
In the works of Lovecraft, Pasteur is only used as a taboo in different works. But the description of Pasteur in the story is closer to the goddess of cats in ancient Egyptian mythology than the bloodthirsty god in Brock's works.

Bast was originally the patron saint of the ancient Egyptian city of Bubastis. Her worship once prevailed among the main cities of ancient Rome, including Pompeii. For a period of time, Pasteur was juxtaposed with the foreign god Naiaratotip and was believed and worshipped by people in Egypt.