He heads to Prime's world.
"Hey," he says. "I need you to do something."
"No. There's some - technological things, but I couldn't find any books or newspapers around, and it's not like I could turn on something through a scry."
"Well, there's two languages that have appeared as native languages among us more than once. Try those, and - include pictorial instructions for answering the mirror, in case that doesn't cut it?"
Turtle finishes the letter (in two languages, with expressive pictures) and then the mages collaborate and it arrives in the new Zev's house. Where it can't be missed.
"Uh," says Zane, looking at the mirror and the letter attached to it. He reads the letter.
And then he goes to get Cam, letter in hand.
Zane holds up the letter and mirror. "I got a thing. It's a confusing thing, I can barely read it. But uh - something about multiple versions of us? Also a magic mirror that got transported to my house?" Pause. "I'm extremely confused."
"Hey, other me! This is going to be really weird, bear with me, and blame your twin. There are multiple versions of us, and we've managed to band together with funky alternate universe magic. It's pretty sweet, actually. But there's a shit ton to explain, so - check out the mirror, it'll let you talk to us."
Following that are instructions on how to use the mirror, and then:
"P.S.: You and I are going to fuck. Just to let you know."
"These people have interuniverse transport magic that reaches farther than summoning? You know what that means, if this isn't some kind of weird prank?"
"Yes. So, ah, thank you." Cam peers at the instructions for the mirror, and fiddles with it, muttering, "If I'm greeted with a live feed of your alternate universe self's junk I will be annoyed..."
"That's not a Zev. Hi, whoever you are, where's the person who originally received the mirror?"