This is an auramancy-based magic system. You pick an area, you infuse it with Intent (time this takes is linearly proportional to size of the area, so doubling the size doubles the duration) and then you bind it to a scroll. Writing certain formulas and runes on the scroll changes the properties inside the area. Those changes can affect anything: the rate at which time passes, the weather, the breathability of air, intensity of light, speed of plant growth, random fireballs popping into existence etc. After an auramancer finishes writing on a scroll, he completes the aura by folding the scroll. The more times a scroll is folded, the more resistant the aura is to overwriting (auramancers can infuse into areas that are already bound to a scroll, but it's harder). There are however two downsides to folding scrolls: 1. making an aura resistant to overwriting makes it indiscriminately resistant to overwriting from ALL sources, including the auramancer who created the scroll in the first place 2. An auramancer can only maintain a fixed amount of folds. For example, the average auramancer, after a grand total of 10 folds, can't infuse anything anymore until one of his previous scrolls gets destroyed or one of his previous auras gets overwritten. For this person, infusing 5 auras with twofold scrolls each might be way more useful than, say, a single tenfold scroll.
Speaking truths as a source of power (not honest statements, but hard facts)