He is worshipped by some as an aspect of Satan, and has served under Satan. He is symbolized by the inverted star in the demonic/satanic pentagram. He has commented on past conflicts with Daimon Hellstrom/Hellstorm, but no further information is known about those.
On Daimon Hellstrom's birthday, February 2, Candlemas in the Satanic Calender, Hellstrom went to investiage a satanic cult, which turned out to be a trap designed by Hellstrom's father, Satan. One of the cultists she his cloak to reveal himself as Baphomet, and the others transformed into a horde of demons. Hellstrom fled the trap and led Baphomet to the top of the St. Louis Arch. After a brief struggle, Hellstrom incinerated a few of the demons, which surprised Baphomet, who thought them immune to Hellstrom's power, as well. This caused Baphomet a moment of uncertainty, which allowed Hellstrom to get the drop on him, and blow out the arch beneath his feet. Baphomet fell to his death, or that of his physical form, which caused his spirit to be cast back to Hell.
The Possessor III, an enemy of the Son of Satan, attempted to gain access to Hell via the portal under Fire Lake. The Son of Satan followed his trail and ran into Baphomet and his legions who were guarding the portal. After an inital conflict, the two joined forces against the Possessor, although they were unable to stop him from accessing the portal.
When the demon-sorceress Salom searched the pocket realm of the Forge Canal for the hiding Dr. Strange. She encountered an object known as the Enigma Box, which she probed to determine its worth. From the box came forth a giant stone form of Baphomet, which questioned Salom� and delayed her quest. When her patience reached its end, she blew the stone form to pieces and went about her way. The pieces grabbed her and attempted to stop her, but she unleashed her powerful magic and vaporized them.
Superhuman strength and durability (greater in Hell, weaker on Earth, possibly Class 10). He is able to project fireballs (real or hellfire?). He, himself, is immune to hellfire. He also possesses some skill with a longsword.