[El's POV: ]
Elements.
In this world, there were six main elements: water, fire, wind, earth, light, and darkness. And aside from these main elements, there were many other elements that were either mainly related to these six elements or were too different from them to be in their category.
'But, these six were called main elements exactly because they were the foundations of all the other elements.'
Magic had many forms, types, and kinds. Elemental magic was just one of many kinds of magic that existed in this Worldline. And the skills with elemental effects were included in this.
But, there were many other elements too. And I called all of them 'branch elements'.
There were other different categorizations that changed according to the area of the Worldline but calling them all a 'branched element' was the easiest.