Originally, Lilith was the Adam's first wife. When God created Adam from the dust, he/she also created a woman named Lilith. Lilith just wasn't what Adams expected. Adam asks her to submit to him, but she was self minded and asked him to submit to her. She was very bored and usually socialized with demons. Finally, she has spoken the true name of God and was cast out of Eden. God turned her into a demon.
The story about Lilith comes from Jewish folklore. There are many stories about Lilith, but elements of those stories are more or less the same.
She is some form of water demon or succubus. She also assumes a shape of beautiful woman and stalks or kills men, women and children. Classic horror movie about Lilith is called "Night angel" or "Hell born"
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