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Gadreel (Heb. גדר האל gader ha-el, lit. "wall of God") is listed as one of the chiefs in the fallen grigori of angels. This is depicted in the second section of the "Book of Enoch"; "Parables". He is said to have been responsible for teaching man warfare. This contradicts the first section of Enoch, which claims that Azazel was responsible for doing this.
Gadreel was mentioned as the third of "five satans" who led other angels into copulating with humans, leading to the creation of the giant-like Nephilim. The others were called Yeqon (or Yaqum, Aram. "he shall rise"), Asbeel ("deserter from God"), Penemue ("the inside"), and Kasdaye ("Chaldean", "covered hand").