The Key to Donestra (Echo of Vindication, #1)

Lydia Damon, a soldier from the mortal realm, has been raised and ravaged by war. She’s lost everything, and when she thinks it’s finally about to take her life too, death has other plans. She’s awoken with a strange type of magic. And when sent on a deadly mission to an encrypted fae realm, she realized her magic is the key to unlocking the gates that have kept a ruthless fae prince imprisoned for years.