Not everyone area in the Inverted Castle is necessary to traverse through, as there are only five bosses to hunt down for the Vlad pieces.
The Reverse Library, or the Forbidden Library, is one of these extra places, but it is an interesting area to trek through hunting and treasure hunting.
True to its dedication to literature, it's full of specific enemies such as armored (and not-so-cowardly) Lions, Tin Men, and Scarecrows. Don't expect to see any Dorothys here, though!
One important thing to note here, however, is that this version of the Long Library has no Master Librarian equivalent. In his place will be some useful items, including another Library Card. If you use a Library Card at any point in the Inverted Castle, you will be sent back into the original castle right outside of ML's office. In fact, this will actually be your quickest way back to the original castle if you need it.
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Before this library trek, note that the Inverted Castle has its own Warp Gates. These do not work with the original castle's.
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