So in Majora's Mask the Twinmould boss room is actually a small area of a seemingly vast desert that certainly isn't within Stone Tower Temple. There are various constructed and geological features off in the desert near by - towers and twisting spires and other interesting landmarks. The area of the fight itself is ringed by the fallen remains of stone pillars. But the desert is seemingly uninhabited. These structures are abandoned. Whoever or whatever built them appear to be gone. So just what is this place and how exactly does Link get there? Is it somewhere in Termina? Is it some other dimension? Is it some sort of illusionary magical construct of sorts? Could this desert have been where the Garo or the people of Ikana dwelt at some point? Is this perhaps the location of the unknown tribe that the Happy Mask Salesman said created Majora's Mask? Could it perhaps be linked to Hyrule by way of the Haunted Wasteland? Could it even be the Haunted Wasteland? If Termina is connected to Hyrule via the Lost Woods, could it also be possible that the two lands are connected by the desert?