Another thing about such Liminal Spaces, the Archive wiki has The Backrooms as merely the eldest and largest, they occur naturally. Perhaps the precursors to the Shadow Order we're familiar with would be akin to the Jades managing the Waystone network, but with guarding the Limspaces, in part because they're some of the only people who can reliably enter or leave a lot of them. For whatever reason, humans are the only ones who naturally no-clip(basically, electromagnetic repulsive force glitches, which is actually supposed to happen 1/7,000,000 IRL, which, uh...) though Ulgus who know about it can use the same techniques the human Shadow Wizards do to enter or leave. Morathi and Drycha, for example.