Zoz was a mighty warlord during the time of Bozbik the Face Breaker's grandfather (who was also an adventurer of sorts). Not much is known about their rivalry, but the root of their animosity towards each other led to the creation of a special spear destined to defeat those of the bloodline of Bozbik's grandfather. Zoz paid handsomely to have oracular divinations woven into the spear so that whoever used it against any of that bloodline would be at a strong historical advantage.

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