In a remote region of space, a faint echo from the past is heard. Against all odds, the wreck of the infamous Traitor Battleship Furious Abyss is located. Astartes of four chapters lend their strength to an expedition to board this vessel, find the fabled Navis Prima (a collection of secret Warp routes), and destroy this abomination forever. But will the residents of the Hulk and the always deadly ArchEnemy let the forces of the Emperor prevail?