A Quest of Aether and Dust (en Inglés) - S. Usher Evans

The epic conclusion to the award-winning Seod Croí Chronicles brings our heroes back together for one final standoff with the evil Eoghan. 

After a devastating loss, the wizard Cade returns to Pennlan to find a country teetering on the brink of chaos. Eoghan has blockaded the borders, leaving Queen Ayla and her beloved Ward without many options for allies. In the fae realm, Riona faces not just politics and a fae realm who doesn't respect her, but a new secret that threatens to destroy the world. 

The quartet's friendships are fractured and reformed under the pressure of impending battles, and they scramble to find whoever will stand with them to defeat the most dangerous wizard in history.