Chapter 416: Urgent!

What can be transparent or invisible? Glass, water, air, or a mirror? Levi Shamrock was constantly guessing, but he still couldn't figure out what he had seen. Once the Celestial Eye opened, the Nine Nether Barbarian King vanished without a trace. Levi wasn't sure what this outcome signified. Could it be a non-existent being? How could such a thing occur? Levi shook his head, finding his own thoughts laughable. He pondered, resting his chin on his hand, "Could it be linked to a mirage, or was there...