I've Already Trained Myself into a Sword God, and You're the One Who Came to the System?

[Single Female Protagonist] + [Fantasy] + [Maximum Level Sword God] Gu Qingyi, the only true god in Jianqi Continent. He once slashed the way of heaven with one sword and led all realms to ascend from land to land; He has been dictatorial for eternity, guarded the void, and suppressed foreign races for three hundred years! When the God King Tangshan came through, trying to harvest the luck of this world, Gu Qingyi was holding the Sky Sword, standing on the nine heavens. Tangshan laughed wildly: "This world is rich in spiritual energy. When I rebuild my cultivation, I will definitely be able to return to the top!" Gu Qingyi raised his hand indifferently and drew out the Mercy Sword—— "Now that you're here, leave your life behind." He backhandedly suppressed the God King and resurrected his dead companions just to take them as slaves. Just when Gu Qingyi was about to continue on the road to invincibility, The long-overdue system finally woke up. [System prompt: It is detected that the host is too invincible. In order to save the dog's life, it will be forced to become a big yellow dog]