Cardinal

The «Cardinal System» (カーディナル・システム, Kādinaru Shisutemu), occasionally referred to simply as Cardinal, serves as the primary driving and management force of nearly all Virtual Reality Massively Multiplayer Online (VRMMO) games in the Sword Art Online Universe. The system was originally developed by Kayaba Akihiko to manage all resources, processes, and events within Sword Art Online (SAO). A downsized version of the Cardinal System was included in The Seed to facilitate the easy management of new virtual worlds.