He gradually felt that the outer wall of the Teaching Building...seemed to belong to another layer!
His perception tentacles, during the ascent, gradually produced a sensation of crawling over a gelatinous membrane.
This strange membrane seems to encapsulate the entire Teaching Building at the map level, somewhat reminiscent of the texture inside an egg. Its presence appears extremely fragile, yet it can completely block his perception tentacles' reverse infiltration into the building's architecture.
After a few attempts, he gave up.
Simultaneously, he also understood, perhaps this is why the "Primordial Ash Apostle" once appeared outside the broken window on the fifth floor of the Teaching Building but was still unable to descend—it was restricted by this layer-level membrane!
However, the presence of this membrane is very mysterious; it gradually becomes clearer as it transcends from the normal Teaching Building layers 1 to 4 and yet almost invisible in reality.
