Glissfoil

 is an herb that grows in Exandria. It possess healing properties, such as being able to burn away infections and cleanse wounds. When dried to preserve it for medicinal use, glissfoil is a yellowish-green leaf that curls on itself.

Campaign One: Vox Machina
After Vax'ildan was bitten by the vampire Sylas Briarwood in Emon, Father Tristan applied glissfoil to his bite wound, causing a burning sensation. Keyleth requested to take some glissfoil in order to continue treating Vax'ildan, and Father Tristan obliged. Upon returning to Greyskull Keep, Keyleth used her druidic magic to revive the dried glissfoil and planted it in the keep's garden.

After liberating Westruun from the Herd of Storms and Umbrasyl, some members of Vox Machina became inebriated during the celebration. The next day, Keyleth prepared a hangover tonic with glissfoil she grew in Greyskull Keep's garden, and it succeeded in alleviating the symptoms.

Later in their adventures, Scanlan drank some sandkheg's hide, a potent alcoholic beverage that Grog had purchased in Ank'Harel. Keyleth again prepared a hangover tonic from glissfoil, which helped Scanlan recover.