Morty knows he shouldn't be screwing around with multidimensional shit. It's dangerous, it's impractical, it's blah blah blah. But it's a potential key to unlimited energy, how does nobody see that? He's built a dimensional siphon (it kind of looks like a cardboard box with a funnel and a TI-84 taped to it, but it damn well works), keyed in the dimensional coordinates to a random plane, and by God he's going to use it.
He flips the switch and waits for the energy bar to fill up.
It does! It fills up very rapidly. Then it explodes, along with the box. There's rather more smoke than there should be, and once the smoke clears someone is standing there.
"Oh dear," Morty says faintly.
"She gave me a ward against casual mental spying, which I appreciate, so."
"I'm favorably disposed, anyway, I don't know her overwhelmingly well - I'm just not a huge fan of mocking her behind her back."
"Ah, Lizzie. Speak of the devil."
She spares him a withering glance. "Snodgrass. Well met, profane."
He grins.
"Seeing if I can teleport through wards. Presented in some order to ensure that if I get a headache it's a little one."
(Martin makes very quiet nyeh, nyeh, nyeh sounds. Elyzia declines to notice.)
"I don't think I mentioned this to anyone here yet, but I do have a sensory component to my power, sort of, and the interiors of those circles past this one fail to exist according to that sense. All the way to the ceiling, or I'd suggest that I could teleport to just above the failing-to-exist part and see if I fall in."
Elyzia nods. "Much as I suspected. So it takes a fairly significant effort to keep you out, but it is certainly possible. The difference past that point is the amount of intent worked into the casting; there is an amount of 'adaptive' magic telling the ward what it should keep out, instead of a predetermined set of parameters. So even though you are not from this world, it still 'recognizes' what you are doing. Good, good."
"Well, that's inconvenient for me and my budding love affair with the magic library, but probably useful in the long run if it means my magic stuff will interact normally with gemini at home."
"I believe that you now know five people who can open the door for you already, or six if you count Headmistress Carson. If you find that insufficient, I can make you a magically unique nametag which you can use to solicit entry from magical passers-by. And I should note that the wards on the department proper are below that level, so you can teleport just outside the door and wait."