Blood.
This liquid was the root that sustained the growth of life across the Myriad Worlds.
Among the Myriad Worlds connected to the Black Tower, even though their settings differed, the guidance bestowed by True Gods differed, and the directions in which lifeforms developed differed, there would always be individuals interested in the blood flowing through their bodies.
Most worlds would, over the course of their development, eventually give rise to a branch related to blood.
For example, there were the blood descendants represented by the Middle-ranking Old King (CH.F.) in the Abyssal Demon World, or the netherblood system corresponding to the world Earl was currently connected to.
However.
The blood possessed by Xia. Cromwell of the Scarlet Knight Order was closely tied to herself, rather than originating entirely from a world's system.
Xia could be called the "Heart of the Knight Order." She governed the entire Holy City hospital system, ensuring that over seventy percent of knights retained intact limbs, survived, or avoided lasting aftereffects.
When several of the Holy City's strongest knights planned to undertake an extremely difficult Mythic-level Destiny Journey, they would often try to bring Xia along.
As for Xia's true origins, even many Knight Order commanders knew nothing about them.
As the daughter of a duke, she had been born during the apocalypse. She had inherited few superior genes and instead suffered from an exceptionally rare immune deficiency disease.
Most importantly.
This congenital disease produced a distinct External Manifestation.
When Xia first suckled her mother's milk, she displayed a bloodthirsty trait and actually drained a small amount of blood from her mother... Later, they discovered that drinking blood allowed her immune system to recover temporarily.
Her thirst for blood grew constantly as she aged, and it had to be arterial blood from living people.
Once