While the smell was not as bad as previous underground ruins the group had been to, it still had the same musty smell like a basement mixed with too much mold growth. That and the odd sour scent that must come with whatever prey the monster dragged in to feast on from time to time. However, there were many places missing the telltale signs that monsters had been there.
Normally there would be cuts on the ruin walls or ceiling. It was a way to ensure that they would not have unwanted intruders. Since that was the case, it meant that the monsters here were deterred from doing that over the years or that they had no worries about the other monsters around trying to enter their specific territory.
