The Shadow Army Trilogy
Forged from the heart of magic, the Tréaltha talismans hold the key to protecting the world from an ancient evil. Locked in an ageless prison, this malevolence waited millennia for the time when the locks binding it in place would falter—a time when few even remember that Tréaltha ever existed. Now, only the descendants of the talismans' creators can hope to save humanity from the oncoming destruction.
Three teens are called on to be more than they have the strength to be on their own, and it is up to them to stand firm and protect the world from the evil it doesn’t know is lurking in the shadows.