Mechanus

In the Dungeons & Dragons fantasy roleplaying game, Mechanus, also known as The Clockwork Nirvana of Mechanus (or simply Nirvana in AD&D 1st Edition) is a purely lawful aligned plane of existence. It is one of a number of alignment-based Outer Planes that form part of the standard Dungeons & Dragons (D&D) cosmology, used in Greyhawk, Planescape and some editions of the Forgotten Realms campaign settings.