Lex felt incredibly suspicious about how easy it was to get Regal Embrace. This was not a simple cultivation technique. It carried a hidden, secret karma that was so well hidden that Lex couldn't even sense it. Its origins were a mystery to him, not to mention how the technique itself could adapt to whatever species cultivated it.
So it made sense that something like that would be quite difficult to control, or get his hands on a second time. The first time he got it, he hosted 2 Demi-Dao Lords inside his Inn for a quest that asked him to get his first guests. Considering the sheer difference in what he had done to get his hands on it, he was highly suspicious. But there was no danger he could sense, so he could only move forward with it.
