Firmaments - Tempest Trilogy, #1

When is it right to kill the king? The infamous Somenus has seized the Faerie throne. The world of Raqia is thrown into chaos, as every nation is pressured to bow in submission to him. In their brittle mortal bodies, Elves and Humans quake with fear: what can they do against an unkillable Faerie King? Somenus, the Nightmare Faerie is said to be so terrifying and beautiful that all become petrified in his presence. Clover the Elf has decided to kill him.
Isabella, the free-spirited maiden, seeks the only weapon that can wound him. Princess Lola has become his prisoner, and the rebel Faeries have turned to Hanz, the charismatic leader. Then there is Leo-the human from Earth. Grappling with life in an unfamiliar world above the stars, Leo stumbles across the only person Somenus fears. And all the while a hidden evil lurks in the wings.