The term Arts referred to any technique which used mana. But where did the term Arts originate from?
The answer was simple, it originated from the Wulin realm. One of the countless realms that fused together with the current human realm alongside the others during the Convergence of Realms.
The Wulin realm was larger then Terra, consisting of five different regions. Each with their own signature sects and families.
As a side note, the Wulin realm was also the same reason why the families were called the families.
Long ago, when the Convergence of Realms first occurred. Each realm had naturally started to explore the other realms.
At the time, humanity (Terra) was still unfamiliar with the phenomenon that was mana.
The story goes that one individual. Upon witnessing another person protect him from monsters, had asked how he managed to kill the monsters.
The unknown protector from the Wulin realm. Unfortunately, didn't speak the same language.
