Celica's wind training explains it in much more detail, but kovomancy is a school of Wind magic, essentially wind blades - focused on crits and bleeds, mostly scaling with a mix of Magic and Focus stats. Aeromancy is your normal wind magic, focused more on multihits and attacking first.
Thank you very much for the answer! I hadn't done the different school conversations yet as I was going physical so far. That sounds like my jam though, love dot builds and am greatly enjoying the game and looking forward to more.
On another note, while it may be intentional because of the fact your doubling down it feels a bit weird to have weapon/archetype specific boosts from traits often be weighted the same as generic ones. example the 10% physical crit chance from precision, and 10% crit chance with daggers from lethality. Even more so when the generic crit one is available at a lower stat value.
P.S. Poking around with wind now, Aerial Edge A and B descriptions seem wonky. B has the same description as base unless my sleep addled brain is missing something, and A has the same description just a bleed duration listed which is hard to value when the other 2 versions do not list duration.
Glad you're enjoying! Making DoTs good is a work in progress, but I always thought it was a cool build.
Generic traits weren't very well planned out honestly, at some point I'll go back and rebalance them a bit. Some are meant to just be a bit more easily available than others though.
Aerial Edge description was bugged, one increases the duration to 9 turns (so you can just have a bleed up, since some traits/abilities get stronger vs bleeding enemies), the other inflicts a stronger bleed (for more damage. Fixed for 0.20.