Shadow frost
(Book)

"In the Kingdom of Axaria, a darkness rises. Some call it a monster, laying waste to the villagers and their homes. Some say it is an invulnerable demon summoned from the deepest abysses of the Immortal Realm. Many soldiers from the royal guard are sent out to hunt it down. Not one has ever returned." --Goodreads

Something dark is brewing in the kingdom of Axaria. A monstrous beast has been laying waste to the villagers and their homes. Described as a shadow demon summoned from the darkest depths of the Immortal Realm, it is invulnerable. Dozens and dozens of soldiers are sent out to hunt it down ... and not one has ever returned. When Asterin Faelenhart, the Princess of Axaria and heir to the throne, realizes that she may hold the key to the demon's defeat, she vows not to rest until the demon is slayed. With the help of her friends, Asterin sets out to complete a single task-the task that countless trained soldiers have failed. To kill it. As they hunt for the demon, they unearth a plot to assassinate the princess. Asterin and her friends begin to wonder how much of their lives have been lies, especially when they realize that the center of the web of deceit might very well be themselves. With no one else to turn to, they are forced to ask just how much they are willing to sacrifice to protect the world that they have always known.