Power is precious.
Power is dangerous.
This phrase, which originated from the Empire and spread within the "Mystic Side," was universally acknowledged by all "Mystic Side Persons," especially those who had experienced backlash, who understood it deeply.
Unlike physical damage to the body, the harm done by "Mystic Side" power often begins with the distortion of the spirit and will, and from there, the body warps.
And the end?
It is naturally death.
The only difference lies in the extent of pain experienced at the time of death.
Spirituality, rituals, secret techniques—any error in these could lead to such consequences.
Arthur was not sure where William had gone wrong.
But Arthur was sure that William had suffered extreme backlash, his spirit and will already twisted, even his memories showing discrepancies!
However, following the distortion, the vast 'Aura of Death' that William contained gave Arthur some new ideas.