Cave nightshade

Cave nightshade, also known as cave belladonna, is used in Herblore to make weapon poison(++) or as an addition to dynamite for poison dynamite.

Players can eat nightshade, but this is not recommended in most situations. When eaten, the player will say, "Ahhhh! What have I done!" and take up to 15 damage (damage taken scales with the player's current Hitpoints). Like most self-damaging items, it is impossible for the player to kill themselves with it. (Note: It is possible for players to eat this without losing health; if the player were to accidentally eat the nightshade, they can teleport away to avoid losing any hitpoints, provided they don't click "Continue" on the dialogue text.)

Damage taken is given by the following formula:

Damage(Hitpoints)={15,if Hitpoints≥20⌊Hitpoints2⌋if Hitpoints<20

There are two spawns in the Skavid caves by the ogre city Gu'Tanoth south of Yanille: the northern-most cave entrance, just south of the western entrance to Yanille, and the southern-most cave entrance within the city of Gu'Tanoth across a bridge. The skavid map (obtained during the Watchtower quest) and a light source are needed to enter these caves. These spawns can be picked up without wearing gloves or gauntlets and respawn about every 54 seconds. Collecting a cave nightshade from one of these spawns is a task in the medium Ardougne Diary. The Reagent pouch does NOT hold Cave nightshade, saying "You can't possibly put that in there. It would spoil your pouch."

Cave nightshade may also be grown using the Farming skill, though this yields a stackable variant of nightshade instead.

Although cave nightshade is untradeable, it is an ingredient to make a tradeable potion; therefore, it has a theoretical value of 1,501 coins when buying coconut milk and poison ivy berries and selling the resulting weapon poison(++).