As mentioned before, the missions that High-level Professionals were capable of completing ranged from Rank S to Rank A and Rank B, while Low-level Professionals were capable of completing Rank C, Rank D, and Rank E missions.
Under normal circumstances, Rank S missions were the highest-difficulty missions. The Rank SS and Rank SSS missions above them would only appear when the safety of the Base City itself was threatened. They were missions that Professionals could not complete alone.
The highest-difficulty mission a Professional could complete alone was Rank S.
To complete a Rank S mission alone, a Professional needed, at minimum, the strength of a Five-star Peak Level Professional. In fact, only a Seven-star Professional would have a chance of completing one alone.
As for Rank A missions, at minimum, a Five-star Peak Level Professional had to take action for there to be any chance of completion. It would be much safer with a Six-star Professional.
By the same logic, although Rank B missions were the least difficult missions that High-level Professionals were capable of completing, and Four-Star Professionals should theoretically be able to do them, being capable of completing a mission did not mean they could definitely complete it.
After all, missions carried the risk of failure, and even the risk of sacrifice. Being capable of completing one and being able to complete it with ease were entirely different matters. If a Professional could not make proper judgments and choices, the consequences would be disastrous.
Chi Qian and the others' encounter was a bloody lesson.
Therefore, regardless of the Base City, the authorities did not support Professionals acting alone and becoming lone wolves.
Back when Su Ming was at the Demon Hunter Academy, he had already encountered various policies supporting teams, squads, and parties in collective operations and activities.