Your only clue from Pnimm is that somewhere in this building are "two items essential to the process of entering the game." The purple and gold pedestals hardly seem like items, given that they're way too big to captchalogue. Then there's this perfectly smooth white thing, which is also too large. And that's pretty much all that's in here aside from the mysterious text on the walls (also not an item) and the posslion-thing statue (also too big to take with you). Maybe Pnimm meant essential items in the sense that a stove is an essential item if you're preparing food? That would imply that they aid in some sort of transformative process.