Witch kiss
contact (toxin) - 500 gp
This mix of several toxins acts throughout all the body. It looks like a brown gelatin.
A creature subjected to this poison must succeed on a DC 13 Constitution saving throw or be poisoned and its Constitution score (without affectation to hit points), Dexterity score, and Intelligence score are temporarily reduced by 1 until the creature finishes a long rest.
Recueil des poisons d´Tapouweb