This post isn't comparing stories, its comparing the power the universes have in battle. Also if you actually know the lore and story behind Halo then Halo 5 makes total sense. I've been warning people Cortana is a catastrophe waiting to happen since the Halo2-3 era. She's rampant, a story concept introduced very early on by Bungie. She's survived her rampancy because she merged with the Forerunner Domain at the end of Halo 4. That's why Chief was able to both beat the Diadact and take a nuke to the face and survive. Merging with the Domain doesn't cure her rampancy, it just prevents it from killing her. So she's completely mad, given near limitless firepower, and being manipulated by Forerunner AI already in the system. What about that is Deus Ex Machina?