Qingming asks Mucheng why. Qingming knew that Mucheng had known his plans of tainting the Angelic Sword but he never acted. If Mucheng truly wanted to stop him, he would have killed Xueqin when he discovered his Seraphim spirit, not take him as his disciple and making him strong to be able to wield the sword.
Mucheng doesn't answer and Qingming shouts at him, calling him a coward unable to do anything. He could have killed his brother, but even knowing the evilness in him, Mucheng was unable to kill Mulong, letting him go and become a god. His indecision is what caused it all so why he acts now?
Mucheng blames himself, he had been blaming all these years. There had never been a second when he doesn't think of killing himself. However, he lasted for Zuyin, wanting to keep her dream of helping everyone.
"You are not the only one that had fallen into a Demon" In the war 70 years ago after Mulong obtained godhood and defeated him, Mucheng went to the Sword Valley to try to find a way to stop him.
As Mulong had become a god, the Sword Douluo was free and Mucheng was able to be accepted for the Sword Souls as the next one and taking the Sword God last test to become a god. He passed the test, but there was a problem. His intent best position had been taken by Mulong even if Mucheng was stronger, he couldn't take it back.
Even so Mucheng implored for the power to fight against Mulong and the Sword Souls finally gave it to him. It wasn't the power of a god but he will be capable of fighting against him, however, once he used, he will need to pay with his life. Unlike everyone thought, he didn't lose his arm against his brother, he sacrificed it to be able to receive such god defying powers.
He was prepared to fight and kill his brother, but he arrived too late. Just as he reached the battlefield, Zuying had fallen and Mulong was already defeated.
Mucheng points his sword at Qingming, declaring that he will stop him. A new dark arm appears over him followed by the appearance of a 9th and 10th golden black-red rings. His greatsword transform, carrying an immense power behind, a power not lower than Qingming.
Mucheng fight against Qingming. Without him being a god, Qingming isn't his counter and they are mostly in a draw. However, Mucheng shows his better technique and strength, showing that 70 years ago, he was the strongest of the Shrek Eight Devils.
Both use their strongest attacks and the clash is won by Mucheng, Qingming receiving Mucheng's attack. However, Qingming is not injured at all about it, instead, Mucheng had aimed towards a concrete part of Qingming's mecha.
A part of the mecha is broken and from it, Xueqin is liberated.
Xueqin opens his eyes and sees Mucheng kneeled on the ground, his body disappearing by the aftermath of using the power.
Mucheng looks at Xueqin and apoligizes to him from all that he did. He tells Xueqin to live without regret and that for the first time in a lot of time, he doesn't regret his decision before completely disappearing.
Qingming leaves the now useless coreless mecha. He coldly look at the disappearing Mucheng, stating that he was a coward even at the end. Mucheng was far stronger and could have easily killed him, even keeping Xueqin safe but like with Mulong years ago, he didn't dare to take his life.
Qingming takes the Fallen Angelic Sword and show that he didn't have lost its qualifications. His The sword was already tainted, so there was no longer need for Xueqin. His strength might have lowered a little but it was enough to accomplish his dream as Bibi was already defeated and there was no one able to face him.
Xueqin invokes his sword and points towards Qingming, saying that he will stop him, only winning a chuckle from Qingming. After being absorbed by the mecha, Xueqin had even loss his qualifications as a god as a size effect, now having the power of a simple rank 99 limit douluo. What can he do against him?
Xueqin wields his sword, putting everything at it as he attacks Qingming who easily fence him, playing with him as their powers are too disparate.
After some time playing, Qingming decides to finish him. Death by his mother weapon, a perfect way to take revenge of the gods that caused his suffering.
Qingming slashes Xueqin with the intention of killing him, but Xueqin is able to enter again into an enlightenment state, his pure intent reaching the peak, and parrying the attack.
Qingming is surprised by being stopped, but he isn't worried. He prepares to use more strength to kill him, but as he prepares another attack the air starts trembling.
Over them, a crack appears in the sky, an incredibly strong power leaking from it.
Bibi, who was defeated on the ground, stands up with difficulty and starts laughing seeing the crack over the sky, saying that she finally had accomplished her goal.
Overwriting the crack, a perfect cut appears in the sky, space itself being sliced from it, creating a perfect hole. A man with the eyes closed leaves from the cut, carrying an impressive presence with wings like swords, shining long gray hair.
As the man opens his sharp eyes, nothing escapes from it, everyone contemplating himself stepped back in terror as they felt being cut in half by merely looking at him.
"Bai!" Bibi happily shouts. The Sword God Bai had descended!