JanjanGilo
M21, the golden age of humanity or known as the dark age of technology, the emperor of mankind had to travel back in time, to create a new timeline where he had to prevent the Horus heresy nor the damnation of humanity from it's peak into stagnation that slowly erodes on itself. He had to shape the ground beneath it for the humans to obey and deal with it, he had to prevent the cybernetic revolt and the plague of uncontrolled psykers that created the OLD NIGHT, that's why he established an academy, only for psykers to use it, the dangers of the warp was already known but no one understands it, so he had to teach how to handle it because he learned hard that denying such thing could destroy itself later on.
But here we will be introduced to a kriegsman, an unnamed guardsman from the Deathkorps of Krieg that was unfortunately sent to such timeline by a mekboy who wields a technology of a necron as a weapon. who knows what he would do there.