"You can't tell anyone. Promise me." She sounded serious. More serious than Night Sky ever was.

She took a breath. "So Sylvan elves have two names. It's something we've always done — public names like Night Sky and Frost Hand and stuff like that. But we have private names too, reserved for family and people we trust implicitly. Only — only Arrakis, Lehna and Red Son know it here now." She bit her lip. "I want you to know it, too."