I'm looking for a book or series, don't know which it is, that my kid picked off the shelf randomly at the library a few years ago but doesn't remember the title.
Magic and science both exist. I think aliens were invading and Merlin was instrumental in stopping them? (Unsure on that part) I distinctly remember that the magic system has two parts, those who can actually cast magic and 'catalysts', people who can't use magic but enable others to refill their magical energy. The magic user clasps hands with the catalyst and says "Catalyst, give me life" which allows the magic user to refill their energy.
I remember there was also something about multiple timelines and jumping between them, Astral projection and hiding in 'time folds, and other weird mixes of science and magic.