The Courier must apply poisonous coating to melee or thrown weapons 10 times. The challenge is awarded after the coatings are applied and does not require that the poisoned weapon(s) be used; however, the game only allows one coating to be applied to a weapon at a given time. The player character can either attack a monster to remove the coating, allow the duration of the coating to expire, or coat a different weapon.
Grants the player character 100 XP upon completion.
This challenge is not repeatable.