Potion of poison
|A nasty poisonous liquid.|
Quaffing a potion of poison will, unsurprisingly, poison your character for 1 to 5 levels (with a strong probability for 3). Your poison status will be set to yellow, or higher if you were already poisoned. Each level (up to poison level 5) will deal on average 8 damage, with a frequency depending on your number of poisoned levels (20% chance per turn per level to lose 1 HP).
They are not entirely useless, however. Characters with rPois may drink them for a small amount of nutrition.
"That liquid tasted very nasty..." "You feel slightly nauseous." (with poison resistance)
Potions of poison were removed in 0.18.