Tomb Robbing, Encountering Foreign Creatures at the Beginning

No! Did alien creatures invade our planet a thousand years ago? What? You also robbed their tombs? Data shows that our planet is suitable for them to survive, and they will invade our planet in a thousand years. Cui Xiaoyao, explode your little universe! Pick up your Xuanyuan Sword and kill all these invaders. With Xuanyuan Sword in hand, he is invincible, sweeping thousands of armies, fighting against demons, shocking all directions, devouring mountains and rivers, and being the only one who dominates.