The Reckoners Multiverse is a Multiverse where the stories of The Reckoners and Snapshot are set. An unwritten story The Apocalypse Guard is also set in the multiverse. It currently has no official name. It is completely isolated from Cosmere.
The vast majority of worlds in this universe are unstable shadows. However, the few stable worlds, the Core Possibilities, are mostly undergoing catastrophes, including Reckoners' world. To save these worlds, the Apocalypse Guard is founded.