A bestiary is usually a volume containing information on different creatures, either living or mythical, depending on the focus of the treatise. In The Witcher, bestiary entries are acquired through listening to folktales and reading books. Once acquired, they can be found in the Journal. These entries describe the various monsters that Geralt meets or learns about during the course of his travels, including their appearance, primary characteristics and usable parts. In this wiki, those entries can be found in The Witcher bestiary category.
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There was also a Bestiary included with some editions of The Witcher.