Apep is the great serpent of chaos who attacks the solar barque each night and is defeated by Ra with the help of Set and the other defenders; his movements were said to cause earthquakes and his battles storms. He is the enemy of Ma'at rather than a god with a cult, and the Egyptians fought him by ritual: the Books of Overthrowing Apep give instructions for making a wax model or a drawing of the serpent, spitting on it, mutilating it and burning it while the spells are recited.
Modern Practice
Apep is not invoked. Modern practice uses him as the figure of what must be bound and destroyed: an execration rite, a written name, a wax image, fire, and no bargaining. The work is protective and it is done once, decisively.