Kai-Arborus Safe through Heroes of Ravenford Book 3 Main text: Book 1. Places Kai-Arborus is the elven tree-city of Ruanaiaith Forest — Elladan’s home in Book 1, built among great Arcarion trees and known for giant eagles. It is a living city in the trees, proud and hard to threaten even by Dunwynn’s knights. See also Elladan Donatello Cairthrellon Thac Thac Wiki