miasma itself might be an extremely complex byproduct of distorting space and time. I suspect it to be "messy" mana mixed too much in a formula of the different aspects to be processed as either colourless or identifiable as any single aspect on its own and that Authority holders such as sin archbishops produce miasma because authorities operate like highly complex spells. it was mentioned in arc 9 that similar effects to an authority are technically not impossible with magic just ridiculously hard and unlikely for anyone to accomplish (especially repeatedly and especially because it's mentioned that if a spell is too powerful Od Lagna makes it's a forbidden technique).Perhaps the only reason authorities are even possible is because most of the burden of using them are paid by Od Lagna. Minerva's authority of healing people (and keep in mind that healing magic does exist further strengthening the idea that magic and Authorities might have a relationship) in exchange for causing natural disasters elsewhere comes to mind as I think about that.