Violet wars volume 2
"Yorick never wanted to see his home world again. Thirty years later, he finds himself sent back to the icy mining colony as a company man--and he can't leave this frozen rock in the dust until he neutralizes the threat. A vicious, long-forgotten machine has newly thawed from the ice, and it seems to have a mind of its own. But as Yorick plumbs the depths of the mines and his own past, he finds a tangled conspiracy that's much more than he bargained...