Lex closed his eyes and did his best to relax, well aware that there was a Dao Lord who was about to possibly treat his body. His system, which was not fused with his soul, was easily detectable if anyone looked into his soul - or so he assumed. Surely, it would not be able to hide from a Dao Lord, right?
That was not his only concern either. He had no shortage of secrets, and he literally had no way of defending against, or even detecting the influence of a Dao Lord. The fact that just studying the sword technique Ten Tribulations had infected him was good enough an example of how easily it was for Dao Lords to trick or manipulate him.
But Lex had long given up worrying about the actions of beings far superior to himself, or he would go mad. All he could do was take things as they came.