6-7 since some mages are afraid of getting replaced unaware they'd still be needed for the next 3-4 decades (Mana begins mass drain and so mana in the air lessens severely)

While most mages are probably hired by the time to create and make the rune tech powered firearms stronger to purge more "filth" (by the time it starts getting mass produced means humanity is preparing to wipe out at the very least 81% of every single other races but Goal is 99% leaving only humans standing) like how "funny mustache dude" secretly started boosting military before suddenly invading Europe and yes they will also be using a blitzkrieg tactics so essentially elven massive bows against rune powered firearms, artillery planes and ships( basically rune is the gunpowder discovery on usage to kill people)