The Elven nations trilogy

When the leader of the Silvanesti elves dies, his sons fall into conflict. Sithas wishes to withdraw from the other races, while Kith-Kanan and his Wildrunners forge connections and trade with the humans of Ergoth. In the second novel, Kith-Kanan returns from exile in the face of the threat from Ergoth's expansion. Now that the humans are no longer allies, the elven nation must unite to turn back the conquest. The schism between Sithas and Kith-Kanan threatens to tear the nation apart. The saga concludes as the Kinslayer war divides and devastates the elven race. For Kith-Kanan and his followers, the hope of the future lies in a new homeland: Qualinost. The new nation is threatened by corruption, treachery, and evil magic.