I've Been Here Since Ancient Times

He is eternal and immortal, coming from the prehistoric era, growing from the era of saints, rising from the dark era, and reaching the peak from the era of emperors. He is the eternal black hand and taboo existence, the butcher of the nine realms and the savior of all living beings. He has created a splendid era of emperors and ushered in the glory of the human race. He has also entered the nine heavens and frightened the emperors and gods. He has even returned from a bloody battle at the end of the world. Even the Immortal Emperor has to retreat three points. People throughout the ages have mixed praise and criticism for him, but he laughs it off. He has only one goal---fight to the end of the world and kill the thief God! After one era after another, he trained many disciples, and one Immortal Emperor after another finally succeeded in getting rid of his control.