The Potion is a quest item that is created during the Watchtower quest. It is used to kill Ogre shaman that live in the caves below Gu'Tanoth.
To make the potion the player must mix guam leaf, jangerberries and ground bat bones bones into a vial of water. This specific order must be followed or the potion will explode, damaging the player. Then, it needs to be enchanted by the Watchtower Wizard, to turn it into a Magic ogre potion.
After the quest, using the potion on the Watchtower Wizard will result in the wizard taking the item, stating that it is too dangerous and may cause an injury.