Down Among the Dead Men — Simon R. Green

THE WITCH'S SIGHT

was their first warning of danger. The four Rangers had been sent to check on the border fortress which had fallen mysteriously silent. What they found defied explanation...but all too soon the nightmares that reigned here would seek to possess them. Even with the unexpected aid of three outlaws--the first a keeper of the Wild Magic, the second the bearer of the last Infernal Device of the Demon Wars, and the third a master bowman--it was doubtful that the Rangers could stand against the creature that waited in the depths below the fortress. And if they could not find it before it woke, this most ancient beast would rise up to wreak destruction on the world.