Compared to the Underground World at the Underground Cave region, the volcanic cave in this place was more dangerous and frightening.
All the tunnels were created by the violent geologic activity of the volcano, they were actually cracks and channels made for lava to flow freely. Thus, it was a place filled with uncertainty.
Perhaps, when you were walking in the middle of a red-hot tunnel, a sudden burst of hot air from a crack in the wall could bake you into a pile of charred bones. You might also take a wrong step and fall into a bottomless valley, eventually diving into a lava pool that could melt you entirely in seconds.
Though the volcano had gradually entered its resting period, at some random areas, violent geologic activity still existed. And if the sudden sinking of strata happened right next you, it was most probable that you would be crushed into meat paste by the cave that suddenly closed up or by the shifting of the stratum.
