Boztoll by Kristy Dixon

Wren, Graham, Ming Li, and Tal are four of the five chosen ones to enter the enchanted cave on the Island of Meegore. Their newfound magical access has left them vulnerable to power-hungry forces at a pivotal time–just as The Dark Cloud breaks the weather across the world. The only hope of fixing this lies in the ancient magic of the silver eclipse.

With all of their responsibility, they still find time to be teenagers and enjoy the fun parts of life. Dating can be just as nerve racking as taking on an evil organization!

In the midst of chaos, figuring out who to trust and forgive becomes critical. The four must embark on dangerous quests and win over allies if they are to save the world from an endless winter. The fate of everything hangs in the balance.