Adeptus Mechanicus (Warhammer 40,000);

Two grim tales of war featuring the implacable legions of the Adeptus Mechanicus.

Skitarius
A discovery of ancient technology sends a skitarii legion under the command of Haldron-44 Stroika into battle on a world overrun by Chaos. When a cataclysm cuts him off from his tech-priest overseers, Stroika must rally his forces and battle corrupt machines and Chaos Space Marines if he is to achieve victory.

Tech-Priest
Magos-Explorator Omnid Torquora of the Cult Mechanicus orchestrates war against the Iron Warriors for control of a long-lost forge world. With mighty Titan Legions, skitarii, and maniples of battle-servitors and robots at his command, victory is within his grasp… until treachery threatens to end his dreams of conquest.