This is a 21x21 dungeon, with many corridors and rooms, from starting point, at the middle, to south it will lead to a chest where is suposed to have a key inside a chest, to east will lead to the ending chamber full of treasures. This is a plain area, with now encounters or scripts. Use it freely at your module.
Check many other prefabs at: http://www.awm.com.br/~nwn