Horde

Den and his companions are thrust into the middle of a war. Maliki's evil horde is ready to attack the vastly outnumbered forces of Dunn Moor Keep, and that isn't everything. They have discovered an artifact that Den is very familiar with and are willing to employ the damaged weapon at any cost.
This is the second book in the War of the Stone. But, if you haven't done so yet, please read the first book, Lich. It is not only free but introduces the characters, as well as the world. The series comes to its exciting conclusion with "Demons," in stores everywhere.