Lex's experience with Demi-Dao Lords was limited. To be more specific, the only Demi-Dao Lord's he'd met were Deities, or to be even more specific, they were the children of Ra, and one of their butlers.
In fact, it was commonly understood that the highest level of cultivation that a Deity could reach was a Demi-Dao Lord. However, that did not mean only Deities could reach this enigmatic realm. Others could as well.
Lex wasn't sure if the Demi-Dao Lord was a stopover realm between Celestial and Dao Lord, but he was sure that even Demi-Dao Lords were incredibly powerful. Their aura alone was enough to kill most, which is why he wasn't sure exactly how strong they were, but to him it didn't matter. After a certain point, it didn't matter how much stronger they were.
Eclipse, who was looking at her obstacle course excitedly, heard Lex's words and blinked. She looked up at Lex, then down at the obstacle course, and blinked again.