(From the publisher):
The unicorns are in terrible danger—can Sheila and the warriors save them? When Mardock, the evil wizard, put a spell on handsome Prince Laric and his courageous warriors, he also invented a magical antidote that could only work during a lunar eclipse. Now, at last, that time is at hand in the enchanted kingdom of Arren. But someone must sneak into the wizard's underground laboratory and seize the magic formula.
Original title: The Final Test
Genre: Fiction→ Children & Young Adult→ Fantasy→ Mythical Creatures→ Unicorns