Bezoars

With the prevalence of poison in the courts of the nobles throughout the Old World, many alchemists offer special equipment to help stave off the toxic effects of poisoned or spoiled food. One such preventative measure is the bezoar, a small rock made of lime and extracted from the gullet of a deer, antelope, or similar creature. To use, simply place the small stone in the bottom of a cup or goblet. Each stone offers a 10% chance to neutralize poison in a drink.

Source
[[Category:B]]
 * Warhammer Fantasy RPG 2nd ED -- Old World Armoury
 * pg. 74