Crimson bound

the long version

"Rachelle must protect the king's bastard son while searching for the weapons that will save her world from endless night"-- Apprenticed to her aunt, training to protect her village from dark magic, Rachelle strayed from the forest path in search of a way to free her world from the threat of eternal darkness. After an illicit meeting goes dreadfully wrong, Rachelle is forced to make a terrible choice that binds her to the very evil she had hoped to defeat. Three years later, when the king orders her to guard his son Armand, Rachelle forces him to help her hunt for the legendary sword that might save their world. As the two become unexpected allies, they discover far-reaching conspiracies, hidden magic... and a love that may be their undoing.