Perfect: I, the nameless quasi-immortal emperor, walk alone in the world sea

I once rescued a willow tree in the Ancient Immortal Era. She was the ancestor worship spirit in the eyes of the heavens. I once taught a young man in the ancient era of chaos, and he grew up to be the emperor of Huang Tian who was arbitrary for all eternity. I once brought up a girl in the ancient era. She was later called the most stunningly talented and ruthless empress in history. My name does not exist in history, I am an ancient being that has been forgotten. The last part of my history is when darkness comes, I step onto the boundless sea alone to stop the darkness. The faint footprints on the boundary sea dam are my only remaining traces. I am the nameless quasi-immortal emperor, the one who started the era of imperial decline. ...