The Fey, book 1 : The Sacrifice
Kristine Kathryn Rusch2013

Their armies have conquered half of the world. Now they want the rest. The Fey, known for their beauty and their warrior magic, have set their sights on Blue Isle. They should conquer the Isle quickly; its people, simple and religious, have never known war. On the eve of the invasion, Jewel, the granddaughter of the Fey's all-powerful Black King, has a frightening vision, one that ties her fate to the Isle forever. Still, she helps her father Rugar head the invasion force. The force meets a surprising resistance. Nicholas, heir to Blue Isle's throne, has always dreamed of battle. Normally, he would be no match for the powerful Fey. But Blue Isle has a secret weapon - a weapon no one understands, a weapon that could stop the Fey in their tracks. Nicholas must find a way to harness this amazing power. Jewel must find a way to thwart him. To survive, one of them must make the ultimate sacrifice.

Titre original : The Fey, book 1 : The Sacrifice (2013)