The Gate of Bones

In the second installment of the Dawn of Fire series, the Indomitus Crusade embarks on a perilous mission to stabilize the war-torn Imperium Sanctus. As Roboute Guilliman leads his fleet toward the shrine world of Gathalamor, ominous warnings about an ancient evil arise, jeopardizing the entire crusade. Shield-Captain Achallor of the Adeptus Custodes is dispatched to investigate, uncovering a beleaguered Imperial force and the malevolent influence of Abaddon the Despoiler, posing a grave threat not just to the primarch but to the Throne of Terra itself.