New Bites: The Tower Chronicles. Geisthawk Volume 1 by Matt Wagner and Simon Bisley

He Lives to Kill the Dead! Written by Matt Wagner, award-winning creator
of Grendel and Mage, and developed with Thomas Tull, executive producer
of 300 and The Dark Knight, The Tower Chronicles is the tale of John
Tower, a supernatural bounty hunter who tracks down the creeping shadows
that the modern world has all but forgotten. His harrowing missions
lead him across the globe and into the darkest recesses of mankind's
most dangerous places to banish a wide variety of poltergeists, demons,
and other unfathomable evils to free his troubled patrons from their
tormentors' ethereal grasp