Wondrous Item, common
A small guidebook that, when opened, speaks with a voice that only the holder can hear. If found in a situation in which you are generally confused about the social norms taking place, simply open the book. For the duration that the book remains open, you understand the non-literal meaning of any spoken, written, or hidden language. The book doesn't uncover lies; just helps decipher the implied metaphorical underlying meaning of whatever is being said or written.
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