Warhammer: Lord of Destruction

"In the dark and distant future, there is only war. When the ancient Doom Slayer awakens once more by the Emperor’s will, and when the gaze of the primordial Four turns again upon the material universe, the veil between realms grows ever thinner. In this age of crumbling barriers, can the Doom Guy truly bring hope to humanity—or even the entire galaxy—as the Emperor desires?"

(Note: This is an ensemble narrative—readers who dislike this style, beware! While Doom’s storyline is absolutely present, the early chapters focus more on a sprawling cast, akin to the "Roboutian Heresy" fanworks. This is a fresh timeline, so the return of the Primarchs and major battles may not follow chronological order. That said, core lore remains intact.)