Acid Oils. Collecting a dead bagiennik's black oils must be done within an hour of the creature's death. A successful DC 15 Wisdom (Medicine) check yields one vial of acid, or two vials if the result was 20 or higher. A bagiennik can use these chemicals either to heal or to harm, but no alchemist or healer has figured out how to reproduce the healing effects. Other than their acidic effect, the secretions lose all potency within moments of being removed from a bagiennik. A bagiennik weighs 250 lb., plus a coating of 20 to 50 lb. of mud and muck.