Moloch's Sanctum is a special dungeon level. It is always the lowest dungeon level, the 20th-24th level of Gehennom, and so Dungeon Level 45-53. To enter it you must perform the invocation. This is the level that contains the real Amulet of Yendor. Magic mapping does not work here, although the only variable in the map is the location of the secret door to the temple. The map looks like: The entire level is non-teleport and ineligible to leave bones.