The Blood King — Gail Z. Martin

Having narrowly escaped being murdered by his evil brother, Jared, Prince Martris Drayke must take control of his magical abilities to summon the dead, and gather an army big enough to claim back the throne of his dead father. But it isn't merely Jared that Tris must combat. The dark mage, Foor Arontala, has schemes to cause an inbalance in the currents of magic and raise the Obsidian King...