Human bio-mechanioids. Where the Techno Communion grow humans and fuse them with machinery... these humans grow bio-mechanical stuff and fuse it with themselves.. I think. They might not even be human but a new artificial race from human stock.
They will have some 'grown on' weapons like this acid rifle, where they flex their weird muscles which contract and spurt out acidic goop. Expect elongated heads (cone heads maybe) and some alien insectoid features.
I see these guys as a small faction of arms dealers or a mafia of some kind, perhaps running clubs and bars where all manner of twisted aliens and humans can mingle and get weird.