Worlds of Rhun is one of several Rhun-module-based persistent worlds. The Rhun module was originally created by djeryv, taking thousands of hours of area design and quest creation. The original Rhun module set the standard for online persistent worlds at the time. The Rhun module was then taken by the Rhunning Team, which included the Great Shayan, and the module was improved further to include subraces and persistent data storage. Indeed, the Rhun module was Shayan's prototype module for Shayan's Subrace Engine. It was the first module to use the subrace engine, which is now widely used in many subrace-possessing worlds.