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The children of the Sahaya Empire undergo a ceremony called 'Fluorescence' once they reach the age of nine.
For nobles, they held their own celebration of the ceremony for their children. As for common birth, since most of them couldn't afford to have a grandeur celebration in their houses and give bigger 'donations' like the nobles, they would go to the Church of Light and that was where they would hold their Fluorescence Ceremony.
It was called Fluorescence because magic is like a small bud that would only blossom at a certain age and it's usually at nine.
It was tested through a clear crystal orb where it was surrounded by nine different kinds of flowers that represent the nine classes of magic one possesses.