The Books of the South (The Chronicles of the Black Company, #3.5-5)

Marching south after the ghastly battle at the Tower of Charm, the Black Company is hounded by shadowy figures every inch of the way. The game is on: the Company versus the Shadowmasters, deadly creatures that deal in darkness and sorrow. When hope dies, there's still survival. And there's still the Black Company.  
The Book of the South is the second omnibus of novels from one of the greatest fantasy epics of our age, Glen Cook’s Black Company series—collecting Shadow Games, Dreams of Steel, and The Silver Spike.