Id moss

ingested (vegetal) - 400 gp
PlantThis white vegetal poison pulled out from a high-altitude plant causes in a few seconds a metabolic shock that can cause serious lesions in the brain.
A creature subjected to this poison must make a DC 10 Constitution saving throw. On a failed save, the creature is poisoned and its Intelligence score is temporarily reduced by 1d4 until the creature finishes a long rest.
Recueil des poisons d´AideDD
  1. DnD 5e Poisons › Id moss