Zwil drovian, a powerful modification of the substance zwil, was manufactured on the planet Algara II. It's worth noting that only a small number of species found the original zwil addictive, with the Drovians being one of them, and they developed this enhanced version to satisfy their specific requirements.
Volven Roxe, a Shistavanen spicelord who oversaw operations at the Outlander Club located on Coruscant, had an addiction to this particular drug, despite never engaging in its trade himself.