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An ordinary day abruptly became a historic turning point when colossal mysterious cubes emerged without warning across the globe, piercing the blue planet like spears of Judgment Day. Endless hordes of monsters surged from these titanic cubes, overwhelming the unprepared military forces of nations in the blink of an eye. To preserve humanity''''s final embers of hope, world leaders ordered a full retreat, abandoning offensive strategies to instead fortify remote cities with hundred-meter-high Walls of Life. These self-sufficient strongholds maintained complete resource independence as humanity''''s last bastion. Years later, the first historic expeditionary force returned with world-altering intelligence: the cubes possessed supreme artificial intelligence, periodically issuing tasks to humans who approached them, with rewards beyond imagination. This revelation ignited humanity''''s resurgence beyond the towering walls as they reclaimed the apocalyptic wasteland.