Till Kingdom Come by Shannon West

When Killian Honeywood is lost in a dark medieval forest, he finds himself in a world that shouldn’t exist but somehow does. Whisked away to the icy, snow-filled fantasy world of the Liminal, home to the Elves and the Dark Fairies, Killian finds a life of savage war and brutal secrets, where he is cursed to fulfill a prophecy that demands not only his life, but his one, true love.
Lured there by a handsome, haughty Fairy Prince he learns he is the long-lost son of a dead Elven king and a powerful witch. Only his blood can restore the throne that is rapidly deteriorating and bringing the Elven city of Daneid close to death and destruction.

But political intrigue is working behind the scenes, along with the evil curse on the throne that has more to do with overpowering obsession than true love. Killian brings life back to the throne again, but in doing so, he stirs up the old evil that could take something even more precious than his life away from him—the one he loves. As danger closes in, he must navigate a web of deceit and destiny and break the cycle of bloodshed and betrayal or lose both his love and his life.

A high-fantasy romance, Till Kingdom Come blends alternate worlds, action, adventure, and dire peril with political intrigue and undying romance.