"In my world, vampires are...not that. They're one of many species of monsters that derive originally from humans but have been twisted to want to hurt humans. One of the most common career paths for people aware of magic is to hunt monsters who attack civilians. Others are witches, like the Grand Coven, and scholars, like the Men of Letters. I'm a former Canadian Woman of Letters who moved to the USA and started a communications company; I've used my influence over the media from my company and over religion though my charitable activities to subtly prepare civilians for the possibility of magical trouble. For example, I've gotten more churches to keep holy water; it burns demons like acid if they attack. I also have some revenue streams from the magical world: I work with a guy named Alex Monroe, who runs a company called Artemis Manufacturing, to arm Hunters and defend them in court, in exchange for some of the spoils from their adventures, and his...distant cousin, we'll say, Sarah Monroe of Demeter Biotech, to sponsor witches discovering new spells.
There are three major sources of magical power: spells that anyone can perform, natural talents like psychic powers, and angel and demon deals. The latter are traditionally held to be extremely risky--Heaven and Hell's administrations change frequently, but their interests are rarely aligned with those of humans--but most people don't have good lawyers," Margaret says smugly.
She pulls some books and cloth bags out of her handbag. "These are some simple spellbooks and starter kits of magical ingredients. I have marked in each book which spells will only work in Milliways, and which are worth trying in your own world. If you want me to demonstrate a few to prove they do what the book says they do, we can do that in my room--by the way, have I explained how the bar works here? You can buy any food or drink you can think of, using any currency in the multiverse, but more importantly, for a businesswoman like me, you can rent a room here. Anyway, what uses of your magic are you skilled at? Are there any you could give a demonstration of?"