The Great Astley Empire has collapsed. Their leader has died in Souta's hands, and he also acquired the secret weapon of the empire.
No one could oppose him now.
No one had that kind of power.
Even assassination wouldn't work because his individual strength was above the rest. No one could deny that Souta was the strongest person that they've known.
Once again, Souta showed his brutal side to the people by executing the generals and commanders of the empire. Several hundreds of B-rank experts have died. Only a few of them were A-rank.
This force was already enough to kill Souta. In fact, even fifty B-ranks were enough to fight him. As long as they had different classes in their group that could fill up their weaknesses, then it would not be a problem.