The world has a kind of magic called chronomancy, essentially time manipulation. It can be done on two scales: local and universal.
Due to how the cost of magic works even the most experienced or skilled of human chronomancers have only ever been capable of stopping, accelerating, or reversing time on a universal scale for a few seconds at most before passing out from exhaustion, so for most chronomancers that's never even an option unless absolutely necessary and as such most time manipulation is mostly done on a local scale on a per-object (or living thing) basis. Chronomancers can slightly cheat the whole universal time manipulation thing by affecting themselves on a local scale, the universe from their perspective slowing down if they accelerate themselves and vice versa, though this carries the usual risks of them aging at an accelerated rate from everyone else's perspective if they abuse time acceleration on themselves throughout their lives.
I've already decided how frozen or time-reversed objects are affected by external forces, in that they are invulnerable or reversed in entropy/damage until they return to a normal or faster-than-frozen time passage, but I'm having a hard time deciding how a chronologically accelerated/slowed object (like an arrow in flight) will be affected by external forces or how it will affect chronologically normal objects when their slowed or accelerated forces interact with them.
How would a chronologically accelerated/slowed object affect a chronologically normal object?
Things I have considered:
- That a slowed down or frozen object would stay where it is relative to the universe instead of the gravitational object it was being affected by, causing all sorts of damage as the slowed down/frozen object goes the opposite direction of the planet's orbit it was affected by.
To resolve this I've made it so that the slower you go time-wise the more you are 'locked in' to your position relative to the rotation of your local source of gravitation, as if you're stuck in a Lagrange point if that makes any sense.
- That simply affecting an object won't do much and that you've need to slow or accelerate its entire path of travel for it to affect other things differently. Assume this is the case if simply accelerating or slowing the object won't alter any results.