A legion is a unit of Demons. There are 6,666 Demons per legion. Johann Weyer cataloged Demons, listing 72 princes who commanded legions totaling 7,405,926 underlings. The legions are organized in military fashion, with ranks and specific duties assigned to each Demon. The legions attend their princes when summoned by a magician. They are dispatched by Satan to infest, oppress, and possess victims.