Zwil, a well-liked flavoring agent, was commonly used in cakes on the world of Algara II. Its flavor profile was reminiscent of a blend of vanilla and cinnamon. This substance produced a mild narcotic effect on the Drovians native to Nim Drovis, leading to its widespread appeal among them. The method of consumption involved fist-sized plugs inserted into membrane-lined breathing tubes. Approximately 80% of Drovian military personnel were dependent on zwil.
Volven Roxe, the Shistavanen spicelord, also had an addiction to a variant called Drovian zwil; however, he never engaged in its trade directly.