The Final Gate was a device built near the end of the Final War, designed much like a Shrine but built to reverse the effects and turn monsters back into mystery discs. Given enough power, it would function as a "reset" on all of the monsters who had been unlocked from discs by the scientists. It was also powerful enough to separate Moo and the Phoenix's souls from their bodies.
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The Final Gate is newly constructed
Moo powers up the Final Gate to reunite with his body