Lin Mu knew that advancing to special grade was vastly different from the usual promotion of a sorcerer's rank.
The four existing special grades had all risen through vastly different paths, and the methods used to assess them were not entirely the same either.
By regulation, the criteria for special grade required combat power capable of overturning an entire country single-handedly, as well as a high cursed-energy-output extension technique that could serve as a trump card!
In other words, a domain was not a mandatory criterion for judging a special-grade sorcerer. All one needed was a high cursed-energy-output extension technique.
Take Yuta Okkotsu, for example. He had not been able to use a domain when he was rated special grade.
It was entirely because the total amount of cursed energy possessed by the Queen of Curses attached to him was astonishing, and he could unleash the absurdly powerful Pure Love Cannon.
Suguru Geto of the same era was much the same. Cursed Spirit Manipulation had even been judged to be the technique with the greatest potential.
As long as Suguru Geto absorbed enough cursed spirits, he could destroy an entire country without even having to act himself!
And Lin Mu had clearly met the latter condition for evaluation: being able to unleash a high cursed-energy-output extension technique.
In other words, he could use a large-scale destructive technique.
During the exchange event, Principal Gakuganji had personally witnessed a glimpse of his technique.
That was why he had agreed to provisionally designate Lin Mu as a quasi-special grade.
As for whether he could truly be rated special grade, that would depend on Lin Mu's sustained combat ability.
Either he needed an astonishingly high total reserve of cursed energy like Yuta Okkotsu, or he needed to maximize his cursed-energy efficiency like Satoru Gojo.