I've always been interested in low powered magic items saving labour. I love the idea of a blacksmith working and enchanted forge or a farmer using an enchanted plow. Much of the medieval world was ridiculously labour intensive so it makes sense to me that magi in far flung areas would use their magic to compensate for lack of labour.
I've recently come across this blog by Bret Devereaux, a historian with a particular focus on military history. https://acoup.blog/
However the most recent post (https://acoup.blog/2020/09/25/collections-iron-how-did-they-make-it-part-ii-trees-for-blooms/) about the way that iron was produced really blew me away, particularly in how labour intensive and time consuming it was to produce really quite small amounts of iron, and how much timber it required too. In any area with decent iron production, you'd be looking at very heavy deforestation and for magi this could potentially be a real problem regarding magic and fae auras.
The amounts of input were vast. For one kilo of iron out of the bloomery, you'd need somewhere between 36 and 100kg of wood for fuel/charcoal. And thats not even including the fuel for the blacksmiths forge. Every step of the process requires skilled people that also need to be supported (because they aren't farming themselves).
A simple enchanted device using rego to separate pure iron from ore would save not just huge amounts of trees, but also eliminate the need for charcoalers, tree-fellers, and the people that smelt the ore. You could even produce huge amounts of iron (if the ore is available) without hacking into the royalties forests or supporting groups of otherwise unproductive peasants.
Something to mine the ore and break it up would also reduce, massively, the time and man power required for mining, maybe an enchanted pick axe, or something like a bound earth elemental. This would also be hugely useful given how backbreaking and dangerous mining is at this time.
Anyway, food for thought.
Do any of your covenants have similar magically enhanced industry?