Out of all the spells from the wizarding world of Harry Potter would you most like to have in the real world and why?

I know there are plenty of spells out there that one could use to make your life a whole lot easier or simpler but I’d have to go with a Patronus charm. I’m sure coming in contact with a Dementor would make one miserable. So, I’d want to make sure I could defend myself if I came across one for some reason. Plus, you can use your corporal Patronus for communicating with others.