All citizen must have strong potential in magic, preferably rune one.

Through many generations, they concentrate magic bloodlines and become strongest magic nation in the world.

Although Mastorios people are forbidden to leave the kingdom to avoid brain drain (or magic drain), Mastorios itself has many agents around the world to havest mana and gather anything magic related.

A prophecy said that Mastorios will collapse one day, due to its immense power, but as far as we know, the kingdom still standing.