The Coldstone Conflict

In the final book of the Illmoor Chronicles, the oldest evil has awoken, and the fate of the kingdom rests in the hands of only one . . .
Illmoor has seen many heroes: Groan, the muscled mercenary who became king; Jareth Obegarde, a mysterious and quick-witted half vampire; and Jimmy Quickstint, a former thief and professional gravedigger who has embarked on more than a few dangerous adventures. But when the ancient and powerful Vanquish rises in Illmoor after an eon in waiting, the continent seems doomed. Towns across the kingdom are in ruin, destroyed by a marching zombie horde controlled by the terrible Vanquish. And there's nothing the few remaining defenders of Illmoor can do about it.
That is, unless they can find an equally ancient and powerful force to combat the one that has set their homeland aflame. This ragtag band of Illmoor's most dubious heroes must join together one final time to bring the kingdom's last great hope for survival into the battle—before it's too late.