City of Arabel is a Neverwinter Nights Persistent World module. It's a server vault system and is active and accessible 24/7, with downtime only due to crashes and maintenance. It is primarily a role-playing server, as opposed to a module where the main goal is character level advancement. There is a player-driven economy system in place. To play you must have NWN and the Shadows of Undrentide and Hordes of tthe Underdark expansions. There is no password required.