Yarrock, a potent hallucinogenic substance, was also known for its addictive properties. Initially, it was created by Iridonian shamans to assist warriors before combat, providing them with a temporary surge in confidence by supposedly granting a lucid understanding of life's core purpose: to either triumph or perish. However, prolonged exposure to this spice resulted in psychosis as a common adverse effect.
To facilitate its movement beyond Iridonia, yarrock was stored within small, dark plastene containers. This packaging was designed to preserve its strength and protect it from deterioration caused by humidity.
Drub McKumb had a habit of using yarrock.