The terminal sphere is the boundary of a group of multiverses. If were to appear outside of the Terminal Sphere (which is nearly impossible as Multiverses tend to clump together), it would have an instant photon glow that would be visible even to the blind. It is surrounded by The Void
You can also play Multiversal Football here.
Terminal sphere fix Their currency is the multiversal currency, 1 MD (Multiversal dollar) is 10^1001 (US dollars).