Dan Abnett – Titanicus

When the vital forge world of Orestes comes under attack by a legion of Chaos Titans, the planet is forced to appeal for help. Titan Legio Invicta, although fresh from combat and in desperate need of refit and repair, responds, committing its own force of war engines to the battle. As the god-machines stride to war, the world trembles, for the devastation they unleash could destroy the very world they have pledged to save.