Magic ogre potion

The Anti-Shaman potion is used to kill Ogre Shamans during the Watchtower quest. This potion is made by using a Guam leaf on a vial of water. Then, Jangerberries are used on the unfinished Guam potion. Once the berries have been added, ground bat bones are added to the potion. Finally, talk to a Wizard at the top of the Watchtower and he will enchant the potion, allowing you to kill Ogre Shamans with it.