Resurrection of Spiritual Energy: Become a Son of the Thunder World at the Beginning

In the world of high martial arts, alien beasts invaded, and humans built huge high walls outside the city. After a hundred years of war, humanity has very few secret resources left. Luo Chengyu traveled through the world of Gaowu and obtained the plane shuttle system. When everyone was fighting for resources, he directly entered the ancient thunder world! Thunder Holy Body? I want it! Holy Dragon of Thunder? Be my pet! Whether it is ancient secret books or ancient artifacts, they will all become his resources! ... Many years later. When alien beasts fully invade Blue Star. The Sakura Kingdom and the Condor Kingdom all fell. Only Daxia remains standing! The alien beasts don't even dare to step into Daxia! Everyone looked at Luo Chengyu in shock. "It took our entire country to promote a tenth-level warrior. Why is he already at level thirteen?!"