The detritus layer, humus layer, illuvial layer, calcic horizon, and ash layer...
Richard passed through layer upon layer of soil structure, sinking about one meter down into the rocks.
At this point, the reassuring sense of gliding through water like a fish vanished, replaced by the sticky resistance of moving through glue. It was slightly uncomfortable and resistant, yet he still could move freely.
Steadying his mind, he traced the source of a spiritual fluctuation within the mountain and continued to sink deeper, attempting to find any possible cracks or passages in the process. After all, he could only introduce his physical body from the outside world after discovering such an opening. But despite searching for quite some time, he found none. On the contrary, the waves from the spiritual source grew increasingly intense.