It said the ruins might be dangerous. It never stated what manner of danger it might be.

[ Says the man who could very well look like a ghoul himself, honestly. WHY is he so excited about this? ]

How delightful would it be, a shambling mass coming out of the ground, summoned by the forces that bound them here long after their departure... the moans of their discontent plainly obvious... what manner of things could one learn from examining such a creature, I wonder?