Sarah J. Maas said this quote

“ To keep Velaris safe, to keep Mor and Amren and Cassian and Azriel and… Rhys safe.I said to Lucien, low and quiet and as vicious as the talons that formed at the tips of my fingers, as vicious as the wondrous weight between my shoulder blades, “When you spend so long trapped in darkness, Lucien, you find that the darkness begins to stare back.”A pulse of surprise, of wicked delight against my mental shields, at the dark, membranous wings I knew were now poking over my shoulders. Every icy kiss of rain sent jolts of cold through me. Sensitive—so sensitive, these Illryian wings.Lucien backed up a step. “What did you do to yourself?”I gave him a little smile. “The human girl you knew died Under the Mountain. I have no interest in spending immortality as a High Lord’s pet.”Lucien started shaking his head. “Feyre—”“Tell Tamlin,” I said, choking on his name, on the thought of what he’d done to Rhys, to his family, “if he sends anyone else into these lands, I will hunt each and every one of you down. And I will demonstrate exactly what the darkness taught me.”There was something like genuine pain on his face.I didn’t care. I just watched him, unyielding and cold and dark. The creature I might one day have become if I had stayed at the Spring Court, if I had remained broken for decades, centuries… until I learned to quietly direct those shards of pain outward, learned to savor the pain of others. ”