Personal Info:
Real Name: Charles Benton
Also Known As: No known Alias
Place Of Birth: Unknown
First Appearance: Doctor Strange Vol.1 #169 (1968) Silver Age Villain
Known Associates: Satannish
Group Affiliation: Sons of Satannish
Base Of Operations: Satannish's realm
Grudges: Doctor Strange and The Defenders
Creators: Roy Thomas and Dan Adkins
Magic: Asmodeus is a magic user capable of manipulating mystic power for a variety of effects, including (but not limited to) inter-dimensional teleportation, casting bolts of mystical energy as destructive force, and erecting energy shields or screens with a high degree of imperviousness to both physical and magical damage.
Not much has been revealed about the early life and history of Dr. Benton, who eventually became a respected New York doctor. Benton approached a young and vain Dr. Stephen Strange asking him to perform charity work, only to be rebuffed.
At some point Benton joined a group of worshippers of the demon Satannish, who garbed themselves in red ritualistic costumes and referred to themselves as the Sons of Satannish. As with all such worshippers, Benton presumably was endowed with supernatural powers in exchange for his soul. At some point, Benton, who had since renamed himself Asmodeus, became the leader of the cult.
Asmodeus at Marvel Database
Asmodeus at Marvel Universe: The Appendix
Asmodeus at Comic Vine