The magic ogre potion is a quest item that appears in the Watchtower quest. It is used to kill ogre shamans that live in the caves below Gu'Tanoth.
To make the potion the player must take a Vial of water, guam leaf, jangerberries and ground bat bones to the Watchtower Wizard, who will enchant it.
The magic ogre potion can not be obtained after the quest, because the Watchtower Wizard will confiscate the potion, claiming it is too dangerous.
An ogre shaman dies as a player uses the potion on it.
- Using the potion on an Enclave guard won't have any effect, but it also doesn't produce the normal "Nothing interesting happens." message. It's possible that a unique interaction was planned but never fully coded in.