Bad Blood — Gail Z. Martin

Jonmarc and the War Dogs mercenaries find themselves caught in a deadly game when a routine assignment for two feuding nobles goes badly wrong, and nothing but blood will sate an unknown enemy.

Soldier. Fight slave. Smuggler. Warrior. Brigand lord. If you've met Jonmarc Vahanian in the Chronicles of the Necromancer and Fallen Kings Cycle books, you don't really know him until you take his journey.