Devil is a term rarely used outside of Manual of Monsters Appendix III — in which it is a race and part of the Burning Legion like daemons and demodands. In other sources, it is mostly a descriptive word like "The clever devils of the western lands have a variety of techniques and skills that are emulated by others." when speaking of smart individuals and their inventions.
In Manual of Monsters Appendix Three, the devils are mentioned and there are several types described: Skin Devil, Sleet Devil, Devil, Heartclutch, Screaming Devilkin, and a list of named devils, however, the validity of the source is disputed.
- Some eredar were known to be practicing diabolists.
- Duncan Senturus considered things that were evil, ungodly, and devilish — relating them to demons.
- Some leggings found in the Burning Crusade were apparently stitched by "devils".
- Westfall is plagued by Dust Devils, who are in fact air elementals
- Mini Diablo is a companion available to players who bought the first World of Warcraft Collector's Edition.
Satan himself or a Warcraft counterpart
The notion of a main Devil does exist in World of War-craft. However the identification of such an evil figure as a War-craft Counter-Part is so far ambiguous. So far, Sargeras, Deathwing or a member of the old gods could be Satan. Kil'jaeden himself also looked like Satan, but is now proven to be not. So far a Satanic figure is not known, infact Sargeras himself was tempted to evil , implying the existence of evil before. If a Satanic figure existed, his adobe would've been in the Twisting Nether, or the Dark Below but there are confusions of whether to identify these different locations to be the same as Hell.
The Designer, Architect
The Satanic figure is regarded as The Designer, a rank in many real life myths proving to be greater than God. Freemasons regard themselves as the architect as they have many symbols resembling architecture. The Designers are the ones who create the illusion of the world, such as the Matrix, Descartes's evil daemon, Plato's allegory of the cave or the Brain in a vat scenario. In Warcraft I, the Rank (WC1) of God is below the designer. This is also seen among the kabala where the Demons of the 11rth dimension supercede God. Also similar in Buddhism where in the 10 realms, the Mara are above God. Buddhist Mara's are demon like figures who're above God, and in Buddhism they're called the Architects of the Illusion.