The Core is the true main antagonist of Amphibia. It[note 1] was a biomechanical, artificially transplanted collective of minds and the true master over King Andrias. It was created long ago from an amalgamation of the smartest minds from across Amphibia's history. The Core lived under Newtopia Castle in a secret basement in wait until the day when the Calamity Box was returned to Amphibia, while acting as the hidden power behind the Newtopia crown during this time.[4][1]