The legion's most experienced Apothecaries and the Mechanicus Biologis worked beside the primarch's sickbed.
Guilliman's vital signs remained stable. His customized power armor was fitted with the finest automated medical systems, enough to preserve a primarch's life through even the gravest injuries.
His most serious wound was at the back of his head. Repeated volleys of lethal bolt shells had damaged bone and muscle, and his brain tissue had suffered severe concussion as well.
"The primarch is currently unconscious. We believe this is a self-protective response. His body is repairing those injuries."
That was the answer given by the Mechanicus Biologis.
In truth, aside from his excitement at treating a primarch, the heavily augmented Tech-Priest was even more thrilled by the chance to glimpse the physiological structure of a gene-primarch.
It was an exceedingly rare opportunity, one that was almost impossible to come by.
Under the pretext of an examination, he sent Guilliman into an MRI device capable of generating holographic images. This medical instrument from the Dark Age of Technology could analyze the vast majority of a living being's physiological structure.
As the report gradually emerged, the Tech-Priest's electronic eyes flickered faster and faster.
"Omnissiah, this is simply unbelievable. How... how do these organs even function?"
On the screen, Guilliman's internal condition was analyzed and displayed. The Apothecaries and Tech-Priests present could only identify the two organs known as hearts.
Like the Astartes, gene-primarchs possessed two hearts. The difference was that the former received theirs through surgical modification, while the latter had been created with them from birth.
Beyond that, however, the holographic image exceeded the limits of ordinary comprehension.
Inside the primarch's body were organs of every imaginable kind, whose functions they had no way of understanding. They had no idea where to begin.
"This is the product