>>107672449Remember how when Terezi gave Dave a coin flip to determine whether or not he'd immediately travel back to ask about godtiering or wait a bit, and it created two Daves because of the possibility creating a doomed timeline? Kind of a similar thing here.
Rose gives John a quest and an ultimatum: Go back and kill Lord English, or we'll all fade from existence. Only his death is necessary, any casualties you and your party suffer during it are for the greater good, you included. So while John prepared for his suicide mission, Calliope instead gave him a choice: "You CAN choose to tell Rose to piss off and NOT fight him, you know." This is framed as the two meals Calliope offers John at a picnic before he makes his decision: Meat (Fight), or Candy (Stay). However, because John isn't a time traveler and due to his heroic nature and desperate desire to feel complete, he'll always choose Meat. But events in the other choice's reality still needed to occur, so the impossible choice was willed into existence as a paradox reality in the only location in existence it could persist in: Within the event horizon of a supermassive black hole.
So the Meat Universe C is real, and exists inside a frog in the B2 Incipisphere. That's still a thing. But the Candy Universe C is "fake", and as such fever dream-like events take place within that universe where "truth" means fuckall. Ghosts can walk the Earth. Time can skip decades ahead meaninglessly. People will do things irrationally, and walk down paths that under calmer circumstances might never happen, like Rose being genuinely happy and self-actualized. And there's also no escape from this purgatory hell; people within find themselves rapidly losing their ability to give a shit, losing relevance and agency, dying without losing their lives. But it's sustained by the black hole that surrounds and mothers it, protecting it from time's embrace.
So two realities, one real, one fake. Both needed for this story.