Queen of Light by Linsey Hall

No one knows I’m possessed by evil…

Everyone thinks that I’m a hero… that I’ve driven the darkness from the land. What they don’t know is that I’ve driven it into myself. I’m fighting a curse that will lead to the death of all I love.
Fortunately, my Fated Mate Iain senses something is wrong. When he learns about the curse, he vows to help. We must delve deep into the dangerous mysteries of my past in hopes of finding a cure. But as the darkness tries to drive a wedge between us, I don’t know if our relationship will survive. Or if any of us will.