Lum the Mad (Greyhawk)

Lum the Mad was a mighty warlord in the Dungeons and Dragons campaign setting of Greyhawk, whose power was at least partially due to his possession of the artifact known as the Infernal Machine. Lum was betrayed by his former general Leuk-o, when the latter came to possess the artifact later known as the Mighty Servant of Leuk-o. Their final conflict left a large area wasted and led to the disappearance of both artifacts, possibly due to plunging through a dimensional rift.

Lum and his Infernal machine have been featured in Baldur's Gate II: Throne of Bhaal, as the creator of Watcher's Keep. He is also mentioned briefly at the end of Planescape: Torment when the final boss refers to a time when the Nameless One "Danced sorceries with Lum the Mad..."