Warhammer: Apocrypha Primarch Comes to 40K

In the dark forty-first millennium, mankind faces unprecedented challenges—— Abaddon, the Lord of the Black Legion and the Despoiler, used the Blackstone Fortress to shatter Cadia during the Thirteenth Black Crusade, and the gushing warp energy tore the galaxy apart. But a turning point also followed. The active subspace allowed the Emperor to be more active in the real universe, and a secret plan was launched at the same time. When the warriors of the Black Legion descended on Macragge, and when the Archmagos Caul was about to awaken Guilliman, an unexpected Primarch suddenly arrived. The vibrations in the subspace caused by the two loyal primarchs made all the four gods of Chaos turn their attention, and the great game of the High Sky also ushered in huge changes—— "Any change is a good thing." "Kill! Kill!! Kill!!!" "Hahaha. (The sound of a cauldron stirring)" "Hmm~ah~that's so interesting." The corrupted Primarchs on the other side also began to obey their master's wishes, constantly attacking the loyal Primarchs, and the galaxy was once again burning in the flames of war.