That demon looks familiar somehow.

I think because there was a similarly-shaped one, without a tail, and covered in lawn clippings, in later issues. Or maybe the shape of it reminds me of Domo. Anyway, from 1984, Conan the Barbarian #155, "The Anger of Conan" Plot and art by John Buscema, script by Michael Fleisher, inks by Steve Leialoha; and a Paul Smith cover.

In a border trading town, Conan is checking out some local girls when Yadlo, a Brythunian thief, runs into him. Yadlo was trying to get away from the local baron, who was going to punish him for some misdemeanor; and Conan couldn't care less, until the baron starts to cut off Yadlo's nose! That seems a bit excessive to the barbarian--a horsewhipping might be acceptable, but cutting him up was too far--so Conan intervenes, saving Yadlo and most of his nose, making a loyal friend of him and an enemy of Baron Vjerzak. Conan had seen dozens of fat toadies like the baron before, but this one had a little something extra: he was an amateur wizard! Having killed a mage and kept his stuff, Vjerzak enthusiastically used his pet demon as his enforcer for his reign of terror.

At a tavern, Yadlo defends Conan from a girl pickpocket, then sets himself to guard while Conan slept, where he's immediately killed by Vjerzak's thugs. Furious, Conan tears through the thugs, then stomps his way to the baron's house, with the entire village turning out to see this one. Vjerzak is fine with that, since he thinks his demon will make short work of him; instead Conan finishes it off inside of a page. Panicked, Vjerzak tries to get another spell to stop the barbarian, but he wasn't a natural sorcerer, and stammering his way through the pronunciation gets his ass thrown out of a window. The townspeople rise up and tear Vjerzak apart, but a sad Conan only wishes little Yadlo was still there to hear the screaming...that's sort of touching, right?

I haven't read Marvel's new Conan books yet, but I'm kind of doubting there's going to be a lot of done-in-one issues going forward. That doesn't seem to be the market anymore.