Does the book only spawn if you haven't escaped with it? I don't recall seeing it since. If so, can it be made to spawn in for extra challenge and replayability?
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The book will always spawn regardless of the times you’ve beaten an individual predator. If you haven’t seen it (And if you haven’t collected the book), then that means it was hidden inside one of the classrooms, which can only spawn there.
Otherwise, if you’ve already collected the book by escaping with it, the book can’t spawn again.