Jehrun

Jehrun is a Verse of Pharon occupying a position opposite Mirron's Reck within the Sinon continuity. It consists of two dimensions containing similar versions of the same Earth-like world - known as Shakrid and Khadris - separated by a manifold dimension of Elemental Planes.

Origin
Jehrun is a bubble universe (aka pocket universe) projected from a zero-dimensional point located on Earth within Legend of the Ultimate Sword's Primeverse. A married pair of geneticists named Jerry and Sarah Methustra engineer a super-human child named Project MUSASHI (aka "Musashi"), who is subsequently raised in the lab, and is exposed to the tabletop gaming habits of the lab technicians. Musashi eventually builds a Mazzaroth device and uses it to make contact with the "goddess" Fate residing in Space-Time Six. She fulfills his wish to play out a tabletop RPG in real life by creating Jehrun and transporting his parents to it alongside him. They arrive on Shakrid as powerful immortals, and must find a way to end the game if they are ever to return to Earth.

War of Worldcraft
An indeterminate time after the arrival of the Methustra family on Shakrid, the planet is attacked by armies of Lunarians, Polarians, and undead humans - all originating from a portal to Khadris - with the intent to steal their share of power from the Elemental Planes. They are commanded by the high priestess of the Lunar religion: Queen Artemis. As the war progresses, Artemis learns of Musashi's existence, and shifts the focus of the war to obtaining him, and bringing him back to Khadris. Jerry, fearing that the war might end both worlds if it continues, decides to end it by handing Musashi over to Artemis. He kidnaps Musashi, enters the portal, and is never seen again on Shakrid. The portal closes, and the War of Worldcraft comes to an end.