Madness of the Fallen — Brian D. Anderson; Jonathan Anderson

Some secrets are best left forgotten. Some names never spoken. In the depths of Shagharath, a creature of great and terrible power awaits. For countless millennia it has languished in its prison. Now the time has come at last for it to unleash vengeance and ruin upon the earth.
As Gewey prepares for his final battle, his courage and strength will be tested as never before. Now he will see that the world is not always as it may appear. And he will discover that common ground can be sometimes found…even with a deadly foe.