The Zi'yuji Universe is a universe that was discovered in the early days of the First War, in the year 1444 NE. This universe (and its' pocket universe) is where the species such as the Lombaxes, its' unique technology, and where heroes like Ratchet, Clank, Rivet, and Kit came from. Due to the actions of Doctor Nefarious and his more successful counterpart, Emperor Nefarious, both the Alliance and Axis were alerted to the Universe prompted the two to find the Universe and in turn spread their war to it, becoming the center of the Zi'yuij Campaigns that would ravage that universe and connected universes.
This universe is one of handful of interconnected universes that share the same name, as their familiarity with each other, other then events and individual changing among them.
- Takes place shortly after Rift Apart, in fact, that entire game's story of interuniversial travels alerts the Axis and Alliance to its' existence prompting the two factions into finding this universe and dragging it into the First Multiverse War.