On the Continent of Aifala, as a prerequisite for professionals, the number of various "Battle Skills" has accumulated to an uncountable level after countless years of development.
Taking the most common among professionals, the [warrior] for example, if you casually find a hundred of them in the Association, the overlap in Battle Skills they each master might not even exceed 5%.
This is in the context of the same region.
If you compare those adventurers active in the Dark Territory and the Southern Islands, the number would be even smaller.
With this as a premise, those who possess their own territories, the powerful nobles in the Kingdom.
With abundant financial resources and the powerful influence necessary to become nobility as conditions, collecting or even monopolizing some Battle Skills capable of real training to enhance Strength, as a condition for obtaining a Professional Level, is not too difficult a task.
