Vengeance of the Immortal

War has come to Placia Mundus with the arrival of Dark Mechanicus forces, including several Warlord Titans corrupted by the Warp Powers. The Imperial Guard requires support. The closest battle group, Indictus, has been despatched to take down the war machines. The problem? Indictus is only a handful of Reavers and Warhounds. Princeps Prime Sythikus will have to lead fearlessly and without flaw to defeat their superior opponents. When his own Titan recognises an ancient foe among the enemy ranks and seeks revenge, the plan threatens to fall apart, potentially taking with it all chance of victory.

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It's little (well, relatively) Titans vs big Titans powered by daemonic forces, with an ancient grudge thrown in for good measure.