From publisher blurb:
To What Depths Will You Sink?
Undaunted by the decimation of your party, the imprisonment of your wizard and the corruption of your priest to the service of Orcus, you still want more! But do you possess the courage to enter a level of Hell itself? Can you survive the White Corridor or the Pit of the Salamanders? And do you dare learn what lies beyond the legendary Mithril Gates? You must to descend into the darkest depths of Rappan Athuk to find out.
Destruction and Damnation?
Rappan AthukThe Lower Levels is the culmination of the most famous and feared dungeon in all the lands. Designed for characters of 12th level and higher and published for the D20 System, Rappan AthukThe Lower Levels is the last in the three-part R series of modules.