The Undying Star Core!
That was the next core after the first Desolate Star Core and the Angered God Star Core.
But it was the most complex core that Zeras had ever seen, as his eyebrows knitted tightly for three days straight of reading, yet the information still seemed to elude him.
"I understand the process already, but the points and effects of the star are rather difficult to comprehend."
According to the manual, what he needed to do was just like what he had formerly done, which was to simply absorb mana into another area in his spinal cord.
But then, the transformation that would result from such was what confused Zeras.
The Nine Star Manual divides each cell present in his body, placing an entire life core within it, so much so every cell is like a living world on its own. It was an explanation effect that Zeras couldn't wrap his mind around.