Blackthorn Bark Cure

The Blackthorn Bark Cure is given by Onoroth in exchange for a Basilisk Claw from a diseased Greater Basilisk in Bloodbark Grove. If the party contains either Corwin, Jaheira or Minsc and one of them spoke with the rats in the Coalition Camp to get a better idea for the symptoms and treatment for the disease, the party can create its own cure from the bark of the Strange Tree. The cure is needed for Dosia's The Uncommon Cold quest in the Coalition Camp.

Alternatively, you can sell the cure to Waizahb in the Siege Camp for 250 gold.