You know, a little over 100 years ago “some guy” they call HP Lovecraft wrote a bunch of things published in pulp magazines, and after he died, some people published his work.
While he was publishing, he had debates with “some guy” named Robert E Howard. Their discussions about Barbarism vs Mysticism and the resulting works added to their main body of work set the stories that most of the Fantasy and Sword Sorcery genres are repeating ad nauseum to this day.
For a folk that like to point out the problems, very few people actually point out that this story is not original, or even “inspired” by century old stories, but some “recoloring” and “recalibrating view” of the same stories.
People think that the similarities were in a close name resemblance from Yogg Saron, or the very name Cthulhu, but anyone who played even the questchains in Stormsong Valley and know Lovecraft work, cant really feel surprise in the least.
Even the sigil thing, the Primus being the Runecarver. If you have read the old Sword and Sorcery tales of the Black Ring, you would really know the Runecarver was the Primus at the moment you laid eyes on him.