If the prerequisites to become an Alchemist were strict, then the prerequisites to become a Mystic Master were simply draconan.
Innate Spiritual Power of Level Six was an exceptionally harsh condition.
An ordinary person's Innate Spiritual Power was typically Level Zero. To possess Innate Spiritual Power of Level One or higher was already considered a sign of extraordinary talent, while possessing Level Six or higher was incredibly rare.
However, some people were different. The children of powerful experts began their Foundation Establishment with Spirit Medicine while still in the womb, enhancing their Innate qualities. The fetus would become akin to a Spirit Embryo, and its talent upon birth would generally be far superior to that of an ordinary person.
This was why most of the elites from the Noble Families in the hall generally possessed Innate Spiritual Power of Level Four or Five.
