I Am Roboute Guilliman! (Warhammer 40K Self-Insert)

In the grim darkness of the far future, there is only war. An ordinary soul, within the physique of a demi-god. A mortal, yet not. In his hands, he holds a unique system, a collection of advanced and unheard-of inventions and tools, able to reshape the very basis of the Imperium, pushing it beyond its current, crippling standstill. Can he, Roboute Guilliman, wrest the fate of the Imperium from the claws of extinction? (SI reborn as Roboute Guilliman, but with a tech system. He has all the memories of Roboute Guilliman, and acts like Roboute Guilliman, but has the knowledge of the plot of Warhammer 40k) From: https://www.69shu.com/txt/45175.htm