Magic is basically like the "will and the word" from the Belgariad fantasy series (because its simple, and I don't want to institute some complex system that could impede on other peoples stuff in the future). That is to say exactly what I said in my application, the exercise of pure will (intent) to render supernatural changes in the substance (state of being) of the world (in short magic is simply willing things to happen). Only certain individuals would have sufficient will to effect changes, this ability to impose ones will upon the world being the essence of the gift of Vash.
The distinction between gods and mortals then in the sphere of magic would simply be the degree to which a being can exercise will to amend the world. Gods having superior (verging on infinite) perception and comprehension as well as inherent power (divinity) naturally would far outclass the limited and finite faculties of mortals when it comes to effecting change in the world.
At any rate, this doesn't conflict with your chi system. Chi is biophysical and internal, where magic is metaphysical and external. Chi deals with the functions of the body and mind of an individual (greater strength, speed, etc), where magic is the pure act of imposing change upon the world external to an individual by force of will (causing a tree to spontaneously combust, causing a stone to levitate, etc). At least that's how I perceive Chi to be from your application. Additionally willpower as it pertains to magic is pure will for something
in particular to happen. Its not emotion so much, but is much closer to suspension of disbelief that what one is intending to happen is impossible according to the laws of heaven and nature.
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@AA: Every good law needs an anomalous abomination to go against it
, you can even interpret such things to be the impetus behind the binding of time to begin with. That said time-skipping into the future is still legit if your portal-seat is in fact bound by the linearity of time (and if changing place-in-time is also valid).