"Three and a half days..."
After figuring it out, Lin Yun lifted his head, his black pupils narrowing slightly.
It took him a total of three and a half days to refine the gray crystal, and from the look of things, he couldn't do this too often.
Otherwise, the time he had to challenge the Heavenly Principle Tower would be greatly reduced.
Whoosh!
With a thought, Lin Yun started to move forward and continue his journey.
At the same time, he observed the scenery of this level of the space.
He saw that it was a continuous range of high and majestic mountains, only they were filled with a chilling aura everywhere. Lin Yun guessed that this should be a mountain range with yin attributes, an ideal place where, according to legend, Ghost Practitioners thrive.