Destroying the part of his soul created by the illusion would result in him forgetting most of the things he had witnessed there, as well as the benefits he had received. For Lawrend, those were worth a lot.
After watching Alissaskiya's path to godhood, Lawrend was certain how he could become one. He was now torn between keeping that knowledge or returning to who he was.
He couldn't write them as it was too complicated to be written anywhere. Even if he could, he would struggle as the visuals he saw were the crux to the path of godhood.
"Wait for me here."
Lawrend waved his hand, and he disappeared from everyone's view.
"Master!"
Their call for him was not responded to. Lawrend was pressed for ideas. He felt pain seeing the concerned looks they gave him, but he didn't know how to reciprocate their feelings if he could barely remember them.