A magic system about springs.
I have a preliminary idea for a magic system that revolves around a magic metal and the twisting of that metal.
The metal draws in some sort of spiritual or magical energy. At one time, all it did was provide a tool that could physically affect magical creatures or spirits, allowing people to fight them on a more even field. But as time progressed, people learned to make springs, gears, and other useful mechanisms out of this metal.
Basically, people create wind-up mechanisms of a sort by treating magically infused metals with heat and oils that lock in the magical energy. (This process must be repeated to infuse more magcic into the metal after the magic runs out)
As one tenses the metal, the magic within is strained, changing its nature. Magic machinery works on the principle of winding these tools to a specific level of strain to create spells out of the magic within.
Hypothetically magical strain changes a magic's nature. Perhaps making curing magic into healing magic. I'm not fully sure.
This is kinda just a silly idea. Let me know what you think.