Qualinesti. Elven Nations Trilogy

Under the leadership of the heroic Kith-Kanan, a new and mighty elven kingdom rises in the wake of the Kinslayer War Kith-Kanan, the leader of the renegade elven society called Qualinesti, has fought long and hard to eradicate slavery in the elven lands and to achieve a harmonious society where all can live freely and equally. When he learns that a secret slave trade is underway in his own city, he sends his warrior daughter, Verhanna, to lead a battalion against the slavers. As the fight for freedom continues and Verhanna sends word of her findings, Kith-Kanan forgets his many great deeds and is haunted only by his failures.
The unfathomable behavior of his son and heir-and the ever-present factions between the elven people-forces Kith-Kanan to deeply question the society he has worked so hard to create.