The Journey Series by Miriam Benisse

The compact has stood for ages, a secret between the royal families of the continent and the Verndari, who guard the pass. When the Verndari send to the Dovos to fulfill a little used clause of the compact - the request to supply a bride - the Dovos respond by sending not a daughter, but a son... moreThe compact has stood for ages, a secret between the royal families of the continent and the Verndari, who guard the pass. When the Verndari send to the Dovos to fulfill a little used clause of the compact - the request to supply a bride - the Dovos respond by sending not a daughter, but a son. In a land where ice and death are old friends, can the Verndari heir and the Dovos' black sheep find their way to keeping the peace, or will the alliance that has kept the world safe for centuries crumble around them? less

Armed with new knowledge and determined to end a war of attrition that has lasted for centuries, Niko and Matthian travel through the pass and into the land of the Deathless.