I Will Promote the Integration of the World

The protagonist is reborn for the third time. But his mind was filled with painful memories of being colonized by aliens decades later. When I was at a loss, a world fusion system came. The protagonist can freely choose various worlds to integrate with this world. What exactly can we do to have the ability to fight alien civilizations in just a few decades? Ps: "Dear gentlemen, the introduction is weak, please read two chapters." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.