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The protagonist obtains the doomsday lighthouse system at the beginning, upgrades step by step on the earth, and collects resources on the earth that can be used for his own use. The system checks in every day to upgrade the lighthouse. When the lighthouse reaches the full level, he will get a doomsday battleship. The battleship has everything that the lighthouse has, and also has something that the lighthouse does not have. The battleship can travel through the universe, go to more powerful planets and stars, obtain cosmic survival resources, and upgrade the doomsday battleship to a higher level. How will the protagonist survive...