In a fantasy world where races of creatures, usually humanoid, are often fighting each other, order has come to much of civilization. The Alliance was formed in fire with a great battle where Lord Luminor was injured deeply. He leads this group of people beneficently with powers that have been unmatched until now.
There is danger now, a new and fearful evil has begun to invade the Morvians. These people live beyond the Impossible Mountains. Although, this does not affect his domain, Luminor must defend these people from the encroaching menace. He forms his army, the greatest so far, combining many groups into a single fighting force. He heads North leaving hearth and home behind protected by a regent and wise Elders to protect his domain and his family.
This leaves Espira, Essie familiarly, and Ardientor sitting at home and worrying about their father. As hybrids, combining human and Gaian ancestry, they are the first and possibly the only salvation of the domain, but they must overcome sibling rivalry and a confining spell placed by their father. When all seems lost, they find the way, Espira especially, to reconcile the personalities and the powers, first to summon assistance from the Ancient Realm and then to lend its use to the army across the Impossible Mountains.