Dark snake

contact (toxin) - 500 gp
ToxinThis poison is a carmine red powder that leaves for life its color on the surfaces it covers, with a wart-like appearance.
A creature subjected to this poison must make a DC 13 Constitution saving throw. In case of failure, red warts start to grow where the poison has been in contact and remain for 1d4 days. During this period, the creature's Charisma score is reduced by 2.
Recueil des poisons d´AideDD
  1. DnD 5e Poisons › Dark snake