Aquila

Commander Caius Atelinas is many things: angel, demon, soldier, saint, and above all, an Ultramarine. A distinguished veteran of uncounted battles, his squad is often sent on some of the most dangerous missions to defend the Imperium of Man from the enemies of Mankind no matter where they show their faces. When he is sent on a mission to retrieve a stranded Tech-Priest on an isolated world at the edge of Imperium Space, he finds himself confronted with something much more dangerous than a downed space craft.

Soon confronted by agents of Chaos, an Orkish invasion, and a squad of Aeldari all seeking the Tech-Priest or the ruination of the planet, Caius and his squad find themselves at the forefront of a fight that will put their skills to the test and sets Caius on the collision course with an unexpected ally - Farseer Naudan Bahad of Craftworld Ulthwé, his long-time rival and one-time ally, who has come to the planet seeking out a familiar foe and a mystery that they both believe had faded into the shadows.