Polarities Mod/Books

Books are a new class of tool sold by the for. Each is (usually) themed around a specific boss and are only sold upon its defeat, providing an infinite buff themed around that boss when used. Only one buff from a book can be active at a time unless the or  are equipped, which allow two or three simultaneously, respectively (except for the, which does not count as a book buff for these purposes). Additionally, some books' titles reference various well-known real-life novels and book series, which are noted on their individual pages. All books are of the rarity and sell for.

Types
There are currently 24 different books available, 14 of which are Hardmode-exclusive.