"Goody."

Looking it up, Daimon Hellstrom was still using the "Son of Satan" name well into the 80's--I'm not sure I have it, but I seem to recall him appearing in West Coast Avengers (#15, if not elsewhere) with a more superhero-styled costume and a shorter trident. It...didn't feel like a good fit, really. But his, and Satana's, dad was retconned from the capital-S Satan, to "Marduk Kurios," which is an immense downgrade; even if on the short-lived Helstrom series, Marduk was played by Mitch Pileggi, best known as Walter Skinner from the X-Files! Marduk's Marvel wiki mentions, at the end of the Warren Ellis Hellstorm series, I think Daimon had knocked up a witch, in exchange for learning his dad's true name to gain power over him, but Marduk was going to be reborn on earth as his kid! The series was cancelled at that point, and while Marduk appeared since, otherwise that plotline was dropped; unless Daimon...took care of it. 

Probably can't call it research, but I spent a week going down a rabbit hole of somewhat grotty 70's era Satan movies on Tubi; most of which weren't great but maybe have moments. Haven't seen the Omen or Rosemary's Baby in a bit, either; or their assorted sequels. 

Also, is this the first time we've had Selene from the Hellfire Club out? I got the Club box set but missed the Hellfire Guards entirely: I don't think Hasbro made big enough runs of those or the Skrull army builders.