King of Scars, by Leigh Bardugo
Face your demons...or feed them.
Yet with every day a dark magic within him grows stronger, threatening to destroy all he has built. With the help of a young monk and a legendary Grisha general, Nikolai will journey to the places in Ravka where the deepest magic survives to vanquish the terrible legacy inside him. He will risk everything to save his country and himself. But some secrets aren’t meant to stay buried―and some wounds aren’t meant to heal.
"Deadly clever political intrigue, heart-stopping adventure, memorable characters, and several understated, hinted-at romances (how will we wait?!) come together in one glorious, Slavic-folklore infused package. Bardugo's star continues to rise." ―Booklist, starred review
"The sharp dialogue and lovable characters continue to enthrall and bewitch long past the final chapter. With twists and revelations cleverly dispersed up until the very last page, this novel is a must-have for any book shelf." ―School Library Journal, starred review