Emperor's Mercy is the first novel in the Bastion Wars (Novel Series) by Henry Zou. It was first published in 2009.
Inquisitor Roth and his henchman Silverstein are sent to the worlds of the Medina Corridor to uncover the location of a set of ancient artefacts. Meanwhile, the Ironclads, a force of Chaos traitors, invades the subsector in search of their artefacts for their own nefarious ends. With the Ironclads’ indomitable army crushing all before it, will Roth be able to find the artefacts in time and prevent a terrible cataclysm engulfing the Medina worlds?