The Troll-Demon War

Five years training, learning battle tactics and strategies.
Or, as Christine's brother reminds her, turning herself into a badass princess warrior.
When Lars the demon, her greatest foe, escapes from Hell, Christine must stop him, and prevent the Great War that will destroy everything.
"The Troll-Demon War"--the first of the trilogy "The Troll Wars" and continuing the "Seattle Trolls" series--puts together an amazing cast of characters from all sides of the conflict, for a darker, fantastic ride.
Be sure to read all of the books in the Seattle Trolls series.