Now that he knew what Ereboths objective was, Lex relaxed. Power lay in knowing what others wanted. With that knowledge, he could manipulate the situation to his benefit. In the beginning, the only reason he was on the backfoot was because he knew nothing about Ereboth, or its intentions.
Now, not only had he gained the advantage, he also understood his intentions, which were to get into his good books. Lex literally held all the advantage, so he relaxed, and let Ereboth make the next move.
He would mold the situation like clay, turning it into an outcome he found acceptable. He was especially interested in Ereboths system, and what could be done with it. In fact, he even got a few ideas of how it could be useful.
Unfortunately, Lex could not actually slay the evil planet and absorb its system, so he would have to settle for something else.
