Magic batteries that store magical energy. I'd been saving them in case we ended up on a world where we were cut off from magic. Pretty much a requirement for slinging bigger magic if you don't want that power to burn you alive from the inside.
Do you know someone that's good with memories/mental magic for this astral projection piece? Because, again, the only person I know who fits that bill is Julia.
Natasha would also be someone good to clue into what you end up planning to do. She's essentially our unofficial official leader and if shirt goes sideways, better to give her a heads up.