Underworld Dreams is a Multi-User-Dungeon, based on EnvyMUD and DikuMUD, and the version Underworld Dreams is running has been fixed by: Kheldar, Drey, Ming, and Bela. According to The Mud Connector,
Underworld Dreams is a resurrected version of a six year old Envy MUD that has a great deal of accumulated changes, tweaks, and history.