Gnilbel was a mage skilled with divinations, which some have suggsted may have had some sort of connection to one of the original Implementors, though it would likely have been a connection based on opposition. Some people, however, believe that this is backwards thinking. As an enemy of Bozbik's father, Gnilbel invested a great amount of time and resources into the creation of a set of Dice that were designed to always guide their user to the location of the lost Spear of Zoz. While it seems that he was never able to locate the Spear, a future adventurer was able to do so by using the Dice of Gnilbel during the Great Monster Uprising.

SOURCE(S): Legends of Zork (game, personal correspondence from the author of 'Enter the Face Breaker' quest)