{Mia Frostine's POV}
Zero collapsed in front of her for whatever reason it may be. Judging from the injuries, Professor Mia thought it might be because Zero was not used to his own power.
There were lots of skills that could make one go beyond their limit, however, the side effects associated with the power increase were tremendous.
The side effect differs from one skill to another but most of the time the side effect severity is as per how much the person's strength increased. The higher the increase in strength, the higher the side effect would be.
Since Zero showed the power of Rank-B despite being only Rank-D, he must be suffering much more than most people. There were not many skills that could increase strength equivalent to two major ranks.
There were rare skills that could increase one's strength by one major rank but two? It was unheard of. At least Professor Mia has never met someone who could do it.
