Earthstone

When she's mortally wounded in the Great War, Tam staggers to the Wanderwood—a place of treacherous elves and dark magic. But instead of death, she finds pointed ears and a potential ally. "A human girl and an elven prince embark on an epic quest to save both their worlds.... Tam is a plucky seventeen-year-old girl determined to join the army by any means necessary-even if she has to sneak in. Loren, the prince of the elves, would rather be a healer than a prince. Neither of them wishes to do what society expects of them. As it turns out, destiny has something else in mind for them altogether, something far grander and infinitely more dangerous. When the humans and the elves forge an unlikely alliance against a common foe, Tam and Loren are thrown together in a desperate bid to vanquish an evil king"-- Provided by publisher