The Ten Thousand Demons Demon Emperor was born with Multi-Eyed Divine Techniques; in theory, every single eye of his could be raised to the Earth Immortal Level.
In reality, of course that was impossible. The Ten Thousand Demons Demon Emperor had only three eyes—the Golden Eye, the Eye of Ten Thousand Poisons, and the Godslaying Eye—that had condensed into Earth Immortal Law.
The Ten Thousand Eyes Mountain Range was just that tiny patch of land; for the Ten Thousand Demons Demon Emperor to draw on the Power of Heaven and Earth and refine three strands of Earth Immortal Law was extremely, extremely forced. So the power of all three eyes was quite a bit lacking.
This was also the main reason the Ten Thousand Demons Demon Emperor wanted to aggressively expand. As long as you gave him a big enough territory, he could keep getting stronger.
The key point was that this opportunity was too rare, with low risk and huge gains. Worth taking a shot.
