An Imperial Fleet, led by Roboute Guilleman, Primarch of the Ultramarines, engages in a grueling 3 way battle between Chaos, the Tau, and the joint forces of the Imperium and the Eldar, Adeptus Mechanicus, Adeptus Astartes, Astra Militarum, Adeptus Sororitas, Quesitor Imperialis, and Collegia Titanica. With the Eldar at their backs, they are proving to be a force to be reckoned, but when a Greater Daemon of Tzeentch appears on the battlefield below, Roboute and all the forces they fought appear above Equus. How will they react to the harmless, yea, even adorable, Planet? And will they choose to fight for it? Or against it?