Fistanarius, the greater balor, is a unique boss monster found in front of the Chaos Gate on the lowest level of the Caverns of Chaos. He is the last boss that most players going for a standard ending are likely to face. Fistanarius, along with his lesser balor companions, will reopen levers for the Chaos Gate that the PC closes as long as they are still alive. Since it is possible to keep the Gate closed by destroying or blocking the two levers, it is actually possible to complete the game without running into the greater balor at all.