Dungeon

A dungeon is an area that usually contains tougher monsters, more dangers, and better loot. Dungeons in the D&D pen and paper RPG are generally the only places where high quality loot and large swathes of money will be found. It usually also contains a boss monster that carries some significance - whether it be he's the target of a quest, or just the guy with the key to the treasure room, or maybe even a great treasure itself. Dungeons have been the mainstay of Dungeons & Dragons games for years.