Nightshade

Nightshade is a quest item used in the Watchtower quest. It is a poisonous plant, and must be used to incapacitate the Ogre guards in order to access the Ogre Enclave.

Eating one results in 43% of your hp in damage:
 * You eat the nightshade...
 * Player: Ahhh! what have I done !
 * The nightshade was highly poisonous