Trial by Fire (Avalon, Web of Magic #6)

the long version

*The ultimate battle for magic is on... Not everyone will survive.* Avalon--the legendary home of all magic--is finally within reach! Its location is revealed on a fairy map, a sparkling globe of wondrous power. The time has arrived for Emily, Adriane, and Kara to become the mages they were always meant to be, and use the map to save the magical world of Aldenmor and all their animal friends. But evil stalks the mages. The Dark Sorceress is after the map too. If she triumphs, people and animals from all worlds are doomed. Emily, Adriane, and Kara must win this battle -- even if it means sacrificing a beloved friend. *Welcome to a world where magic is real and friendship is everything.*