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The Lazarus Event is the sequence that reboots the world. It is also sometimes called the Wipe.
The Ourobeans are responsible for triggering it, and so far they've been regular as clockwork. It's almost always done as a response to the Apophis bringing their reality-ending weapon to bear, as the conflict with Humanity reaches its climax.
Once triggered, it cannot be stopped, and everything in the world is reset. The location of Xenotaphs is changed, territory ownership is wiped clean, shops and their stock are jumbled up... absolutely every entity in the world is removed.
Currently the Wipe seems to happen every 7 days.