CthAngband was an Angband variant written by David Thornley and set in H.P. Lovecrafts' Dreamlands. Some of the new features of CthAngband include new races, classes and a skill system, where skills can be improved by using them. Because CthAngband is set in the Dreamlands, it features a whole new world of dungeons and dungeon guardians. sCthAngband built on this with a number of technical and gameplay advances.