"There is," he says to the demon, "a way to travel between worlds without being summoned. I will trade you the knowledge of how to make it for three of them and some help identifying a habitable planet in our new dimension."
He gestures. They'll fit in this ship. "They take you to a completely arbitrary location in the new dimension, so you're almost guaranteed to land in vacuum. Then we'll need someone to conjure for Earthlike worlds and help us get coordinates for one so that we can lightleap to it."
And they don't actually need a lightleaper but he's not going to tell her about the teleport. "Okay. I will trade you information about how to travel between dimensions for three of the devices used to do that and then help identifying and travelling to an inhabited planet in a new dimension, is that a deal?"
"Thank you!" And to Issiak, do you have someone in an escape pod to jump for us or should we have someone jump with her, ask her to make air when they land?
Agreed. "All right, want to jump dimensions with me? I'll need air where we land."
The worldleaper detaches; an anchor and a jump component that has a simple activation switch. The current models require you to enter an activation code, but the very first prototypes didn't and that's what they have.
Second worldleaper to take them one more dimension out.
"Thanks so much! Okay, you probably know better than I do how to conjure for habitable planets."
A lot of fist-sized balls of rock later she's got one.
"Thank you so much!. The latest lightleapers have pretty cool targeting, if you can just make me one in the 22 series I can go find the planet myself."
"That's all we needed; you happy to go home?"
"For sure. They're called worldleapers, Fëanáro Curufinwë invented them in Year of the Peace 7, the blueprints are all chiplocked but prototypes you should be able to grab."
"My pleasure." He sends her home. He teleports to the new planet and verifies that the air is breathable and the gravity tolerable. He parks the lightleaper in space somewhere in the intervening dimension so people can teleport through it without a ship. He bounces back to Issiak. "Got one, two-off from here, taking the ship there now, someone should check whether it's not by sheer bad luck neighbors to a discovered dimension. How long does Yeerk reproduction take?"
"We need demons, we can't infest them, people who are conceived adjacent to the daeva worlds will be daeva when they die."