The Spirit Stone The Silver Wyrm, Book Two

Prince Dar of the Westlands calls the new fortress of Zakh Gral "a dagger laid against our throat." It was built by the Horsekin, ancient enemies of his people. To destroy the threat, the elven prince has called upon his dwarven and human allies. Their leaders know that if the Westlands fall, their own throats will feel the dagger next. Joining them are two powerful dragons, who have their own bitter reasons to hate the Horsekin. But the fanatical Horsekin have a powerful ally as well, a new goddess. Alshandra's priestesses have announced that She has given Prince Dar's lands to the Horsekin-and that his people must be utterly destroyed.