Arthur Dimitri— An Immortal who could fight the Sovereigns head-on and even win such battles... Why would an individual like that be incapable of curing his own daughter, if her disease was related to foreign mana in one's core?
After all, an Immortal like Arthur should have tremendous control over the mana in his body as well as the surroundings, so why couldn't he just expel the atmospheric mana from Sophie's core using his interdependence, co-existence, and relationship of mutual benefit with the mana in nature?
The reason was pretty simple.
When mana enters an individual's core, it becomes a part of the given person's body... It doesn't matter whether it had been converted into the mana that the individual in question possessed or if the mana wasn't converted at all and had tainted the individual's mana core.
Once the ownership of mana is shifted to an individual from its natural state in nature... No one can safely control the said mana in another person's body.
