He heads to Prime's world.
"Hey," he says. "I need you to do something."
"Oh! Oh, right, I forgot - my magic's the only transferable one we've found yet. Except maybe this one, but - yeah, you can learn runecasting for sure."
"I was the test case for whether it worked for non-natives of Medallion, and it worked for me, but I'm just a human, albeit a previously dead acolyte human."
"Do you prefer French or Spanish?"
"Daeva get the languages of our summoners automatically, which conveniently sidesteps the problem of how to negotiate task and price while one of you only speaks Chinese and the other doesn't know any languages because she started to exist as a non-ex-human daeva fifteen minutes ago. I only learned English, some of the Spanish, and half-a-dozen demon-only languages the long way around. Sixty-eight is still a lot, but for a while a linguistics department which had found a different relatively friendly demon to teach them demon languages used to summon me to confirm that she wasn't lying to them about what words meant what things - I didn't talk, but they'd have me confirm translations. And they were linguists, so."
"... I think you still need the translation spell," observes Cypress. "Even with - sixty-eight languages already."
Max shrugs, and hands a scroll over to Cam. "It has to be in a non-native language, but the chant's written down for you in both languages."
"What happens if it turns out my summoning-acquired languages count as native for this purpose?"
"It'll still work, but - do weird things. If you want to be safe, Cypress, Prime, Spring? You have languages he hasn't learned, should we use those?"
"Or I could just translate this into one of the demon languages," says Cam. He peers at the incantation and then utters a rendering of it in such a language.
"Yes we do!" He can take a moment away from attention to the ship controls to kiss her once. Okay, three times.
"I guess the first takers at the 'better than Dumbledore' school of runecasting run by Phix and I will be alts of ourselves," snorts Max.
"No, we're planning to start a school, we're in college for useful things but it's rapidly looking more and more pointless."
"That happens. I skipped college, since I found out about summoning when I was seventeen, learned to do it, spilled the beans, got killed for it, and have been demoning it up ever since."
"It was a hundred and fifty years ago, Hell is really comfy, and my remaining dissatisfaction about the situations is on track to being brilliantly solved, assuming you folks can make portals to other places later. I can see my parents again and don't have to wait indefinitely to see Adana again and I can interact with the mortal world!"