During the quest "The bronze beneath the lake" you're searching the Lhe a Rhemen ruins. There are some stone heads there that you can interact with, and they ask you a question that suggests that I might be able to earn a bonus of some kind. Answering their question makes a symbol on the walls glow, but nothing else happens.
I solved the quest itself, so I know that all the stone heads and other stuff in the ruins aren't needed for that.
Is there still something else to be done in those ruins? And how do I get those stone heads to do anything?