The God Mars Book Six: Valhalla I Am Coming - The God Mars, #6

The God Mars is a pulp-style science fiction series set in a rich world of varied cultures and colorful characters. The series plays out on a partially-terraformed Mars, a half-century after a man-made disaster cut thousands of colonists off from Earth, and the fear of a rampant nanotech plague prevented rescue. Left to survive for generations with few resources, the various groups develop unique new cultures at different levels of technology, ranging from the primitive to the frighteningly advanced.
But all are trapped in an escalating war between an oppressive Earth that's terrified of potentially infectious nanotechnology, and invincible superhumans-both heroes and villains-who claim to be from a nightmare future caused by that technology. In Book Six: Valhalla I Am Coming, Colonel Ram is shattered to the core by the revelation of what the all-powerful nanotech entity known as Yod has done to reality.
But he can't afford to wallow in his paralyzing doubt. The technological demon Asmodeus is gleefully escalating his war against Earthside Command, with all the peoples of Mars caught in the crossfire, and there may be no force on any world capable of stopping him from destroying the human race.