Thyssel bark, a tree bark exclusive to the Haruun Kal planet, originated from the thyssel tree. Its hallucinogenic effects, akin to those of spice when chewed, rendered it highly valuable during the Clone Wars era. Consuming it in its raw form was potent enough to induce lasting changes in brain chemistry; however, roasting it refined it to a state where it was only as harmful as a light wine.
Chewing thyssel bark resulted in red-tinged teeth for the user. The Balawai government of the planet was financially supported by the thyssel bark commerce. Grassers consumed this bark, leading to conflict between the Balawai, who sought to harvest it, and the Korunnai, who desired it for their grassers.