A toxin made from briarthorn.
Briarthorn is a Herb that can be gathered by Herbalists. Requires 70 Herbalism to gather.
Briarthorn can often be found at the base of trees in level 10-25 zones. Rarely, [Swiftthistle] can be harvested along with Briarthorn by picking Briarthorn nodes. It is also known to be dropping from various plant type monsters.
According to legend Briarthorn grows where Agamaggan's blood touched the soil of Azeroth after he fell in the War of the Ancients.