When the Phase King mapped out the interior of the large and ancient prison structure, he did not manage to figure out what each compartment held.
Still, even a basic map was enough for Ves and the other Larkinsons to figure out a lot of clues.
For example, there were hundreds of cells of the same size as the one where Ves had just escaped from. These were large enough to accommodate several organisms that were several times taller than an average human being.
The Phase King's survey also revealed over a dozen larger cells within his range.
These cells were much greater and were presumably designed to hold phase lords who could only become as small as a light mech.
Then there was a massive chamber in the center that was exaggerated in several different ways.
It was large enough to hold a sub-capital ship or an equivalent large organism.