A Space Between the Multiverse?
Baron Mordo tells Strange that he must pay for tinkering with reality as he did (in Spider-Man: No Way Home, we assume). So he’s cuffed and brought here. Considering that Multiverse of Madness is dealing with the fallout of Steven messing with the universe, wherever this might be might be some sort of equivalent to the Temporal Variance Authority in Loki, just… for shared universes instead of timelines.
