My speculation is that the arcanist spells cause a sort of aetherial imbalance in their targets, which manifests as the short-term effects.
We already know that too much of any aspect of aether can cause aethersickness, so what if this was further refined for that very effect? I'm still a staunch believer that any school of magic could find a way to replicate another school's without too much difficulty, but the way the aether is consumed and shaped is what makes them all different.
The battle system is really only a small selection of available spells, many of which I'd assume are either unnamed or are based on function. And that's not even touching upon "older" schools of magic that have been rediscovered and reinvented over the various eras.
tldr: I made guesses. There's not any specific lore for or against these guesses.
We already know that too much of any aspect of aether can cause aethersickness, so what if this was further refined for that very effect? I'm still a staunch believer that any school of magic could find a way to replicate another school's without too much difficulty, but the way the aether is consumed and shaped is what makes them all different.
The battle system is really only a small selection of available spells, many of which I'd assume are either unnamed or are based on function. And that's not even touching upon "older" schools of magic that have been rediscovered and reinvented over the various eras.
tldr: I made guesses. There's not any specific lore for or against these guesses.
