"It's very simple, Lex," Cassandra said as she sipped her tea. "Humans are not bottom of the barrel. There are trillions of races below us, not to mention the microscopic realms and all the living entities they contain. But having many races below us does not necessarily make us powerful, either.
"Even when a human reaches the peak of Celestial, they are unable to cross that barrier and become a Dao Lord. After a very detailed and extensive investigation into why, carried out by multiple races that do have recognized Dao Lords, it was concluded that humans cannot comprehend the Dao as well as other races. For them to reach the same level, they would need many times more opportunities than their peers of other races."
Cassandra paused for a moment, as she seemed lost in thought. Lex, on the other hand, was enjoying the crash course that he was getting right up until he felt a strange pressure on his chest.