A succubus is a Lilin-demon in female form, or supernatural entity in folklore (traced back to medieval legend) that appears in dreams and takes the form of a woman in order to seduce men, usually through sexual activity. The male counterpart is the incubus. Religious traditions hold that repeated sexual activity with a succubus may result in the deterioration of health or mental state, or even in death.
In modern representations, a succubus may or may not appear in dreams and is often depicted as a highly attractive seductress or enchantress; whereas, in the past, succubi were generally depicted as frightening and demonic.
The word is derived from Late Latin succuba "paramour"; from succub(āre) "to lie beneath" (sub- "under" + cubāre "to lie in bed"), used to describe the supernatural being as well. The word "succubus" originates from the late 14th century.
According to Zohar and the Alphabet of Ben Sira, Lilith was Adam's first wife, who later became a succubus. She left Adam and refused to return to the Garden of Eden after she mated with archangel Samael. In Zoharistic Kabbalah, there were four succubi who mated with the archangel Samael. There were four original queens of the demons: Lilith, Eisheth, Agrat Bat Mahlat, and Naamah. A succubus may take a form of a beautiful young girl but closer inspection may reveal deformities of her body, such as bird-like claws or serpentine tails. Folklore also describes the act of sexually penetrating a succubus as akin to entering a cavern of ice, and there are reports of succubi forcing men to perform cunnilingus on their vulvas that drip with urine and other fluids. In later folklore, a succubus took the form of a siren.