This is a large and ambitious dungeon. The characters must circle through it trying to collect 20 sigils in the correct order. Some parts of the maze are only revealed if the necessary sigils have been collected first. The dungeon has 7 levels with approximately 4 to 20 rooms per level. It is not necessary to visit every location to complete the dungeon. With all the retracing and back and forth the characters must visit at least 200 locations to complete the dungeon. It would probably take most groups at least 40 hours of playing time to successfully complete the module. There is a fair amount of searching that must take place to find the necessary sigils and secret doors and so forth to advance in the dungeon. The adventurers must cooperate well or they will fail. An intriguing adventure design. It would be a fun challenge for players who like tackling "killer modules".