Whether a Swordsman or a Magician, as long as they can reach the Gem rank, or possess power comparable to the Gem rank, they will be called a "Saint."
The palace of the Reinnaier clan in "that Empire" is also called the Great Saint Palace.
The character "Saint" carries a special meaning in the Source World.
Perhaps the reason the highest-rank Swordsmen on the Akasha Continent are called Sword Saints is also somehow connected to that world.
The Ancient Magic Civilization was established by Reinnaier based on the knowledge and technology brought from the Source World. Maybe precisely because of that, some customs from the Source World were brought back, and by a twist of fate, passed down to the present.
Since this organization chose the word "Saint," which bears such special meaning, as its name, and is now entangled with the Abyssal Aura, then even someone like Reiger thinking of the Source World because of this is not strange at all.
