The Underdark is a fictional setting which can be incorporated into Dungeons & Dragons role-playing campaigns. It is a vast subterranean network of interconnected caverns and tunnels, stretching beneath entire continents and forming a literal underworld for whichever surface setting it is added to. The Underdark has also been used as the setting for Dungeons & Dragons-based fiction, including the Legend of Drizzt trilogy by R.A. Salvatore.The Underdark is a strange alien landscape populated by b