In the ONTONAUTS multiverse, everything anyone has ever believed is literally true.

Each of its realities is a manifestation of a belief system: In the District 51 reality, the truth is that aliens rule the world. In the Rometerna reality, the truth is that the gods of ancient Rome exist. In the Regio Christi reality, the truth is Catholicisim. In the Picopolis reality, the truth is that transhumanism will save us all. And so on, ad infinitum.