Forscythia

Forscythia (or possibly Forsythia; spelling unconfirmed) is a hag fortuneteller in Vasselheim and the sister of Trysta. As an NPC, she is played by Matthew Mercer.

Appearance
When Vox Machina first met her, she was disguised as a beautiful elven woman dressed in a fine silk gown, with a metallic headband, her dirty blonde hair behind her ears. In her true form, she is a large, hunched, gnarled humanoid with a crooked nose, pointed chin, and long, twisted fingers.

Forscythia sold two greater healing potions and a potion of caustic liquid to Tiberius. Vax'ildan traded her a favor for a vial of potent poison.

Tiberius Stormwind
To some degree, Forscythia was helping Tiberius in his quest for magical artifacts. She had previously told him the location of the Boros Ring, but she refused to give him further help until he had found that item.

Vax'ildan
When Vax asked to trade for a vial of potent poison, Forscythia did not ask for monetary payment, but rather an unspecified favor, to be claimed "down the road". As of yet, that favor has not been claimed.