River and Pearl rested underneath the tree, recovering from both emotional and physical exhaustion. Lex did not mind because he needed to get his bearing before doing anything.
First, he thought back to his fight against that unexpected Sovereign. There were still quite a few things he could have done in that fight, but Lex had held back on purpose. His Butter Knife and Tyrant's Mask both were Divine tools and filled with divine energy. He could have used them to create some kind of miracle.
However, the reason Lex did not opt for that was because it was obvious that his enemy was prepared for him. By using them, or any of his other techniques, he'd just waste their potential and put himself in a weaker position, exhausting all his means. To fight against him, Lex could only make use of his techniques or tools that he'd always hidden from everyone - such as his Dao Body or Back of Atlas.
