"I'm very magic. But doing it myself might not be the best idea, the fairies have been working on the project of interplanetary colonization for years. They haven't done any yet but there's this neat dome habitat somewhere very inhospitable on this planet. This planet ish. Recreating their project to create an adjacent pocket dimension with a duplicate of this planet on it miiiiiight be faster, if it can be done."

"I was not expecting this spell to work at all, let alone this well, wow."

"You got very lucky landing on me! Uh, also, probably shouldn't surprise you with this only after we've sunk a ton of costs, this universe has an afterlife situation." 

"That... sounds better than the alternative, is it?"

"I wouldn't trade it in. But, uh, it is not perfect. There are two afterlives, and one of them catches the overwhelming majority of people, and the other one catches one every couple of years and is, uh. It is, strictly speaking, my reason for existence to solve it."

"...that's a strictly speaking?"

"I mean, I'm not going to stop solving problems when that one's dealt with."

"I mean, more, how is it the reason for your existence."

"Oh! Remember how I said I was extra magic? We have a God. She set up the main afterlife on purpose and the other one not on purpose. She managed to empty it out a couple thousand years ago but she made me to fix it for real. She found a," she waves a hand, "a place, sort of, that had--patterns, stories and people, that happen over and over again in different universes. That's how I knew other universes would exist. She found my pattern and decided I would be good at it. So she made me."

"O....kay. Nice work if you can get it. Uh, what do you need from me to get on the terraforming thing - we ideally want separate planets, here, one to put refugees on since it'd be a lot to dump on an inhabited planet and one to put more magical byproduct on."

"Does the byproduct one need to be habitable all over?"

"No, just needs people to be able to visit for short periods safely to establish byproduct dump sites and visit them when they want to become mages."

"Okay. That'll be easier. Does byproduct have mass?"

"No. It's nothingness."

"Nothingness like vacuum, nothingness like magical annihilation juice, nothingness like something weirder?"

"It's not... juicy. It warps space, is that weirder?"

"Pretty weird! Sorry, that was an idiomatic usage of the word juice to mean energy."

"The warping space can be useful, it can make gates in controlled doses."

"Sounds useful. If, uh, possibly dangerous."

"The gates haven't hurt anybody besides small-scale if disfiguring accidents. The disappearance points in the ground are the bad news."

"Yeah, the planet those go on should be not in this star system. I wonder if falling into your star would destroy them or just eat the star."

"I would bet against the star."

"Yeah so that one needs to be not just a planet nobody's using but a star nobody's--ah. Hmm. How long has your planet been appreciably declining in mass?"

"For thousands of years we thought the disappearance points only grew when somebody used magic. It only became clear they grew on their own very recently. It accelerates as they get bigger. If you want to find us a star no one's using with several destructible planets we could easily put off the question for a long time, longer if your magic can replace the essentials of ours."

"I can do magic that arbitrary people can't learn, and so can the fairies and the angels, but there is, also, magic that anyone can learn. Actually that's where fairies come from in the first place, not that they'll usually admit it. Anyway. What I was wondering was how your mass reduction interacts with orbital mechanics--see, planets have a velocity, and the reason they don't just fall into their stars is because they're going too fast--my concern is the possibility of accidentally slingshotting reduced-mass planets out of the solar systems in question. But if it takes that long for a planet to get used up probably we can just keep an eye on that even if it does happen, which, I don't actually know if that's a risk because I'm not an orbital mechanics person. How hard is your magic system to learn? Our general-purpose one is versatile but very detail-intensive."