Runes?

Xukong then went on to explain to Lin Mu what a sewer system was in brief.

"Oh yeah, I think I've heard of them. The Empire's capital has that to drain the water from all the rain that they get." Lin Mu spoke.

~Sigh~

"At least this world is not that backward…" Xukong muttered.

"But still, senior it's strange that there are caves here too." Lin Mu replied.

Lin Mu had looked around and discovered that there were actually quite a few caves here. Though most of them were about ten to thirty meters deep in the ground. Even his spirit sense was barely able to reach them due to the density of the ground.

If it were not for it having strengthened recently, he may have not even discovered it. Lin Mu thus decided to take advantage of these caves. He first found a suitable location that hidden from people and also had a cave below it.