Privateer Press has more of their March releases on preview. This time around, it's the Black Ogrun Iron Mongers. They're like fish mongers, but for iron... Ok, so that doesn't really help. What they are, are the maintenance crews for Cryx. If you're looking to keep your bonejacks and helljacks running around on the field a bit longer, you'll probably want to check them out.
About the unit:
Iron mongers are black ogrun metalsmiths who combine their craft with rituals of blood and dark magic. The blood-forged weapons they create would be a reason enough for any captain to take iron mongers on as crew, but these ogrun are also skilled in the repair and maintenance of Cryxian ’jacks. Privateer Press Homepage