Promised to Be a Knight, But What the Hell Is an Astartes?

Luo Xia is a man of absolute loyalty to the Emperor. After an unexpected death, he finds himself transmigrated—and the news seems good at first. He arrives in a world of swords and sorcery, wizards and knights, dwarves and elves, a realm where gods sit enthroned above and dark gods lurk in shadow. But there is a catch: this is not the Holy Terra he once swore to defend with his life. "Damn it! If I'm going to transmigrate, at least send me to the right place! I wanted to be a Space Marine—an Astartes! Who asked to be a knight?!" Then the system greets him: "Welcome to Warhammer 40,000. You are fortunate—your absolute loyalty caught the Emperor's attention, and He has summoned you here after death. This is a world of roaring chainswords, psychic tremors, interstellar species at war, and the chaos gods running rampant in the warp. Sounds dangerous, doesn't it? So if you want to stay alive, strive to become an Astartes!" "Wait... is this system even legit?" "My goodness! A wicked Slaaneshi daemon has just escaped from the warp! And you, as an Astartes warrior bearing loyalty and honor, must defeat her—let the Emperor witness your devotion! Mission reward: Ultramarines gene-seed ×1, Emperor's Honor Points ×800, and increased resistance to Slaaneshi daemons." Luo Xia stares at the exotic, black-stockinged demoness prostrate before him, swallowing hard. "Who said this system is weak? This system is absolutely insane!" [Off-System][Invincible]