Time magic?

[He's honestly surprised by the question. For once he hesitates, though it only lasts the briefest of moments.]

Not very high, if I'm honest. There's not a lot you can do without the Eye of -- the infinity stone, the time stone --

[His efforts to head himself off from naming the artifact backfire, leading instead to tighter clarification.]

-- which is definitely not in a library in Kathmandu inviting some kind of invasion if anyone finds out it's there -- oh, for --