Kasdeja is a figure from Jewish and Christian mythology, believed to be one of the fallen angels who rebelled against God and was cast out of heaven. The name “Kasdeja” is derived from Hebrew and means “The One Who Lies”.

According to the apocryphal Book of Enoch, Kasdeja was one of the leaders of the group of angels who descended to Earth and mated with human women, producing a race of giant offspring known as the Nephilim. Kasdeja is described as teaching humans about divination, the use of roots and plants for magical purposes, and other occult practices.

In some interpretations, Kasdeja is considered to be the same figure as Azazel, another fallen angel mentioned in the Book of Enoch who also taught humans forbidden knowledge and was associated with the Nephilim.

Overall, Kasdeja is a relatively obscure figure in Jewish and Christian mythology, but his role as a fallen angel who taught humans forbidden knowledge has been influential in occult and esoteric traditions.