Wow. People hating on this arc. As if this' worse than the plot convenient materials, plot convenient members added, plot convenient skills used but never learned, plot convenient age increasing item because power of the lady boner so MC can bang a child or two without getting shamed, and plot convenient excuse for MC to magically not hate his father. I'm probably missing more tropes.
This arc irritates me because of my last point in my rant, the fact that the one guard sits on a statue base of her supposed creator that has a symbol on it like the one on MCs hand but has no idea who the creator is or what the symbol means, MC practically noped out because power of friendship and left lady boner possessed, and the spirit that enters lady boner sees the symbol and lets dude go and fk all was said about it because she put the TV on.
This entire story is irritating. His power is cave king but acts more like mining king with a side of not quite slavery. I feel like the MC and still have no idea what this mark does. He's supposed to be a "king" and leader but he's a weak idiot. Story spent a lot of time on the external expansion but gave like 3 panels to the internal.
I had hope for this arc. But it really did not start good. A massive library and the only two books we get anything out of are comic relief pron. The library was pointless. Let me spoil the ending for you. Dwarf is going to show up and he's going to be the creator of the entire ruins. But he still won't speak.