- "This is a heavy, plain-looking, metallic jug with a hinged stopper. Despite its common appearance, you feel reluctant to touch the thing, as if it might bite you. You've been told there's some sort of monster trapped inside of it - but peering into the jug's mouth reveals nothing but inky blackness."
The Monster Jug is a miscellaneous item in Planescape: Torment.
Using this item set the Gereleth trapped inside free in order to fight it.