Manuscript Discovered in a Dragon's Cave (Rękopis znaleziony w Smoczej Jaskini) is a fantasy encyclopedic compendium published in 2001 by Andrzej Sapkowski. It contains descriptions of many exotic beasts and plants found in his writing. Many of the creatures and herbs found in the Witcher series are described there.
Selected entries[]
The links below do not contain the actual text from the compendium, just paraphrased versions at best.