Not to be confused with Underdark (4e).
Descend Into The Darkest Reaches of the Realms
The ebon depths of the Underdark have spawned more fables and fears than any other region of Faerûn. In this lightless world, the hazards of its unforgiving wilderness are exceeded only by the perils found within the communities of races such as the aboleths, illithids, duergar, and drow. Explore the labyrinthine tunnels and endless caverns of the Realms Below to encounter the denizens and dangers of one of the most intriguing, inhospitable regions in the Forgotten Realms game setting.