Darius Supreme - Chapter 616

... ones.

Every Journeyman Mage worth their salt had to at least, do this much. It was impossible to go far in the realm of magic if one did not systematically create their own personal system and relied on the spells of others all the time.

The first step to this is to choose a theme for your system based on your elements. It could be 'speed', 'damage', 'defense', 'attrition', 'cost reduction', 'close combat enhancement', etc.

So for Ash who had the elements of Gravity, Water, ...