Author has written 2 stories for Harry Potter.
F = -kx
Of all the inventions in human history, I feel the spring has been the most important, as it was the first to show us that we could store energy in a usable form other than by burning fuel.
Ars Magica is copyright Atlas Games, while Harry Potter is copyright JK Rowling. Some character names belong to Robst, and are used with kind permission. Anyone unfamiliar with his works should go check them out, they are remarkably good work of professional quality.
My update schedule is "When I feel like it", and will often be variable, as I have other demands on my time. I recommend if you wish to know when my stories update, you follow them.
All of the Uncle Alex stories presume the HP timeline starts in the year 2000, and Harry first attends Hogwarts (or should) at age 11, in the year 2011. As a result, all technologies are appropriately advanced to that era. This lines it up with key events in the Ars Magica Modern timeline.
I am unashamedly a Harmony supporter, and dislike Albus Dumbledore and Ron Weasley. Dumbledore because he's allowed to make far too many mistakes, and his methods are unrepentantly manipulative and deceitful, and Ron mostly because I've known people like that and they irritate me. I do not believe either is evil, or irredeemable, merely that they need to be given a sharp shock to make them realise the error of their ways. So expect the two of them to be getting some attitude readjustment tools applied. LARTS at the ready.
On the Order of Hermes, and the origins of it's name, you should look up Hermes Trismegistus.