Atari and BioWare helped to promote and release free downloadable hakpaks, models, and tileset expansion packs, which greatly expanded the possibilities of mod-making. The "Players Resource Consortium" ("PRC") was released in early December 2003, and is a group of hakpaks adding classes, races, skills, and spells to the game. The "PRC" has roughly three times the number of prestige classes the original game had. It also adds dozens of epic spells, and many normal spells that make better use of BioWare's Aurora engine. Psionic powers have also been included. The "Community Expansion Pack" ("CEP"), originally released in March 2004 (last updated in January 2017), is based on the "Neverwinter Nights" community's fan-made material. This freely downloadable expansion was compiled by members of the community. It combines a selection of previously released custom content into one group of hakpaks.