If she had had no experience with anything related to magic, this would have been difficult to understand.
"Yes, that's how it is with the body.
The higher your capacity, the more your body has to adapt.
So if your mana capacity increases, the more your body can carry and tolerate.
Thus, even after you died, your body carried a huge amount of the mana His Majesty had been giving to you back then while you were asleep.
It should spread out and be released some time after your death, and more quickly if your body was cremated.
However, Evania occupied your body and thus would be able to harness it.
Since they know about the long-lived races, they must have planned to maximize the mana you had.
Evania and her fake allies would have been able to use it as much as they pleased until it ran out.
However, mana recovers over time, so they can simply help her recover," Alwin surmised.
This meant Arabella and Evania were used by the schemers for whatever they had in mind.