In many ways, Halo is a blending of themes together to create something new and different. In the art style, it is a combination of cassette futruism and popular animes set in the future, like Cowboy Bebpop, Gundam Wing, and Ghost in the Shell. The bulky electronics of the Pilar of Autumn, the heavy brutalist architecture of Halo’s structures, the many text of the UNSC’s UI (the little bit we see of it). But it is also, at its core, a religious story, such is the symptom of a society that has roots dating back to Christian foundations. The Covenant, the badies you are pitted against, are religious fanatics hellbent on eradicating any who defile their sacred ring that will usher in their Great Journey. Turns out, by virtue of being alive, humanity is considered a defiler. Moreover, those who built Halo are like ancient Egyptians or Persians, dating back over 100,000 years before the events of the game. So ancient, and enigmatic, they built these structures that we don’t understand for reasons we don’t understand.