"Hey!" A little girl floats into Milliways, riding a tree branch and wearing handmade clothing. "This is the wrong door! It's supposed to be a house!"
"...They're flying monsters. Flying and exploding things with red light. Some of them on the ground but mostly flying. They attack everything they see until a Witch or someone kills them. Burn down villages an' blow up cities. We walked all the way to Albania and I don't know where my brother went and we got on the boats and saw the Neuroi attacking the city and Witch Knights fighting them and there's always more. And people say they made a giant storm."
"Oh, dear, that does sound bad. I can probably think of some good books for your Knights, yes. What I really meant was books for you, though - Bar, can I have a copy of End of the Mountain?" It appears; a thin paperback with three machines flying in formation over a mountain peak on the cover. "I think you'll like this one."
There are dozens of orders of magical knights with long and short histories. Pretty much every one of them, plus equivalent organizations from other culture groups, have gone out to fight the Neuroi and are recruiting much more aggressively than in the past and do not hesitate to brag about this in written works and ask for donations. An advertisement suggests that if you are willing to fight as a witch you don't even need to pay for your equipment and training to join these old noble orders anymore, in fact, you can get paid, they're collecting enough protection gifts to do that!
The ones that are succeeding enough to put out the advertisements will hire any adult witch who can use a magical shield and a bow as a mercenary, and are looking for children to train up in the next three to five years, though the exact requirements they judge candidates on vary a lot.
The Royal Order of the Rose, based in England, has published a book on how to make simple shotguns. The opening line is "All warriors who be brave enough to stand against the demons which currently despoil our world, all of which is under the eyes of God, must fight with weapons suitable to the task and the enemy, no matter that the weapons be inelegant and dishonorable. We wouldst fail in our duty if we do not do our utmost to destroy the enemy. With that in mind this text contains instructions for the manufacture and best use of a weapon which has proven adequate against the foes known as Neuroi in recent battles."