The masked lone 'intruder' that attacked the Solitary Manor was actually Lu Qingyun.
Before he had set off for the Solitary Manor, he had taken the last of the Triple Divine Essence Pill that he had saved for Lie Xingyuan and him.
He had actually forced himself to consume it as he was about to confront the Solitary Manor as his body was still weak from his recent internal injuries. Only a miracle pill like the Triple Divine Essence Pill would be able to fully treat his injuries and renew his profound strength.
At the same time he had also use his golden roc fire to change the profound aura of his celestial-step divine sword and he had also changed the hilt.
It was because he knew that his opponents would be able to recognize his divine sword and recognize who he really was. Therefore, he had changed the appearance of his divine sword so that they may think that he was another person instead.