Cinematical has it on very good authority that as recent as this past summer, the central mythology of the sequel was being based on Zoroastrianism, which is one of the earliest religions on record. Like with most religions, the war between good and evil is at its central core, and in terms of evil there's Ahriman: the god of darkness, the eternal destroyer of good, personification and creator of evil, bringer of death and disease.“ They go onto note that ”we cannot confirm that Ahriman is or isn't the villain, but if the writers are still working with Zoroastrianism as the basis for the film's mythology, then it would make sense that Ahriman would play a big role in unleashing evil spirits into our world, much like Gozer did in the first film. From GB News / original source