Sarah D. Maas. The courtyard of the Fog and Rage (№ 325860)

- Nesta is different from most people, - I said. - She shows himself cruel and wicked, but I think it's just a way to isolate themselves from the rest. It is a shield, similar to what is in the mind of Rice.
- To protect from what?
- From the senses. I think Nesta is feeling all that he sees - and he sees too much. And often burned about it. That invisible wall protects it from shocks, excessive worry over everything.