The Bezoar is a rare accessory dropped by Hornets in the Underground Jungle. They can also be obtained by killing Toxic Sludge monsters in the underground.
When equipped by the player, it grants full immunity to the poison debuff.
Bezoar Accessory, Terraria 1 2, Terraria HERO, Terraria Wiki
Trivia
The name and appearance of this item are in reference to real-life bezoars, and its effect is in reference to the fact that such items were once believed to be antidotes to all poisons
