Spells needed mental energy and "Breath" as their fuel.
The "Breath" was the power source, while the mental energy had to trace the diagrams needed for the activation of a spell.
A complex system of lines made a diagram, each line carried a specific meaning that produced the desired effect once they were linked together.
To put it simply, a spell was a set of lines that carried different meanings, and that was fueled by mental energy and "Breath".
Noah had been able to understand those meanings in the past and reproduce those that interested him through his body, creating a martial art which produced similar effects.
Yet, he had never been able to create a spell, he didn't know where to start on that field.
His Elemental forging methods needed materials and wills while the diagrams needed to copy the natural language of the "Breath" in the world, something that he couldn't hear nor read.
