Super God: The Imperial Guard Returns from the Start

I, Qin Shuo, transmigrated to the era of the Unification Wars in Warhammer 40K, at the end of the 29th millennium. I was still a baby when the Emperor chose me to become one of his Custodians! From the mountains of corpses and seas of blood of the Unification Wars to the star-spanning expanse of the Great Crusade, I followed the Emperor, slaying aliens and slaughtering daemons, witnessing humanity's most glorious and most brutal age. Until that damned Webway War... I fell in battle. But the Emperor did not let me vanish. He sent my soul back to my original world, the Super God Universe, and bestowed two supreme treasures upon me: A mysterious ring containing the equipment of the Custodes, And a holy sword engraved with the words “Emperor's Wrath”! When I opened my eyes again, I was beneath a familiar starry sky. Looking at this world, soon to be ravaged by gods, demons, and the Triangle Body, I silently tightened my grip on my sword. The Super Soldiers of Super God Academy? Are they really that tough? The Void Theory of Death God Karl? Laughable! The Ultimate Fear? I'll show you what humanity's fury looks like, the true fury of the Emperor of Mankind! Once, I was the Emperor's blade, fighting for humanity's survival. Now, I have returned bearing the Emperor's Wrath, ready to fight once more for my homeland! This time, I'll make this universe understand who its true master is!