The portal system is replaced with a more secure successor over time. Inferno's subworlds are still non-urgent, but the daeva do get a portal to Limbo, where the humans present are much less likely to be able to freak out and successfully move from freaking out to doing anything along the lines of "nuke the rogue daeva and hope the summoner's within the blast radius". Cam visits his dad and gets a letter to his mom asking that she show up at his dad's house. He makes useful things in ways that won't be too traceable (if his dad's fridge has slightly more bacon and cheese and apples to share with the neighbors a few days in a row, who'll notice?), as a short-term intervention while awaiting more acculturation to the way Limbo works so they won't upset any very delicate balances. The portals to the other worlds can wait until there are actual plans on what to do with them. And possibly until their alts have more free time to help. In the meantime, Cam has his parents again.
"So - maybe a big mountain far away from the ocean, with a river between the mountain and said ocean, and a complicated reservoir arrangement in the mountain so that once-a-week refills can handle it?"
"Adorable little ones with little fake plastic trees!" she giggles. "And we can just do those tests in Pantheon."
"Maybe a New Kystle dayside? There's got to be actual irrigation they could use done there."
"Oooo. Ooo, I love you, have I mentioned, lately? Let's go with Cypress's, he'd love us for that."
"And," she points out, "I bet Prime knows people that know a lot about irrigation, considering. We can crib from their notes."
"I do think that for Limbo in particular we need to use as little non-daeva magic as possible, tempting as it might be. Not unless it's runecasting, anyway. All of the others have a scaling problem, and Limbo is very big."
"Runecasting has a scaling problem too in the sense that we have to either centrally produce the scrolls or turn the knowledge totally loose."
"Probably not. Nobody's sick there. It's worth a shot. We could also try Rae, it's effectively a desert everywhere but actually in the ocean, but he'd be less value-added, I think."
"Maybe. But installing a god involves trusting it pretty thoroughly, and if there were any that were that trustworthy I feel like Spring might've located them."
"Yup. We can't upset the delicate balance between the only two gods that we actually know."
"It's an excellent shortcut, absolutely. If it comes down to it I could encase populated Limbo in a gigantic dome or several so it could self-contain a water cycle and then it wouldn't need much added maintenance. There could be little external gravitic supports. But for today - you want to meet my dad?"