The Dungeon Siege Siege Editor (Formally addressed as "Siege Editor", or "SE") is a powerful tool for creating maps and mods in the Dungeon Siege Engine. It was released shortly after the release of Dungeon Siege for free. It was designed to be as user-friendly as possible while retaining all of the core features and abilities that was used to create the original Dungeon Siege campaign and multiplayer campaign. New mods created are called Siegelets and can be used to create either entirely new maps or modify the existing maps that came with the game.