Custom content creators are known as builders in the "Neverwinter Nights" community. The Aurora toolset allows builders to create map areas using a tile system; the appearance and surface textures of the area are defined by the area's selected tileset. Builders can overlay placeable objects onto areas, and use the built-in scripting language NWScript, which is based on the C programming language, to run cut scenes, quests, mini-games and conversations. Third party utilities allow builders to create custom content for most aspects of the game, ranging from new playable races and character classes to new tilesets, monsters and equipment. Custom content is added to the game in the form of hakpaks. Builders have used the Aurora toolset in combination with hakpaks to create playing experiences beyond the scope of the original campaign. Additionally, the Aurora toolset has allowed for the creation of a number of ongoing persistent worlds modules.