The scholars are excited to see what he's managed to remember or reverse-engineer and write down.

Their foundation was almost entirely based on wards, but you can still derive a lot from that. Wards require mechanisms such as the redirection of various kinds of energy at specific levels, filtering poisonous things from the air you breathe, or keeping your lifeforce levels stable.

They compiled the sorcery rituals they knew and experimented with them, pivoting from known and remembered elements and analyzing the results and comparing, etc, until they had a long list of basic magical principles and their proprieties. From there they created and refined and then refined again.

Currently they have sorcery rituals for (among other things): flight; medium-scale telekinesis that follows a programmed set of instructions; small-scale but very precise "freeform" telekinesis; large-scale stone-shaping; enchantments that change the default temperature of a room to freezing or boiling, while still allowing people to get inside unmolested; large-scale water-filtration; large-scale irrigation; making crops grow better, faster and protected from pests; the list goes on.

This is amazing. They will get on copying this at once.

And they turn right around when Kaede says Felix's worlds made some pretty interesting discoveries about diseases.

Germ theory! There are tiny microorganism that people can't see without aid and are the cause of many diseases! And here is why! It's both more and less disgusting than it sounds! Some more underlining science! How to sterilize medical tools properly and how to keep water sources clean!

...sounds fake but ok they'll look into it.

Anything else?

Oh, lots of things. Earth got quite creative with non-magical solutions: the printing press; steam-engines; the industrial revolution; so many things.

...they might need more than a single presentation for this, would he like to write more books?

Gosh, he would be honored! He does admit he isn't a scholar, just someone that knows a lot (thanks to the widespread availability of books (the printing press is great!)).

"They're stalling," he says when they return to their room later.

"The sorcery? The science? Both?"

"You, with the science. They don't need to find excuses to keep you here when you provide them so readily. Not that I'm inclined to care, but." Shrug.

Sigh. "Do you think they are at least likely to use the science?"

"Probably, there are obvious economic gains from using it. But we might want to tell more people anyway."

"Yeah, and they technically never said to keep that a secret."

"They didn't," he agrees. "Hey, wanna use this as an excuse for a date in the gardens?"

"Of course!"

So they have a lovely date in the gardens, watching the fountains and magic statues and glowing plants and eating fruit, and are not bothered.

The gardens are lovely. The date is lovely. Kaede is the loveliest of them all.

"I'm going to leave that metamancer a message," he tells Felix that evening while he's writing a letter, "to meet me there tomorrow."

Nod. Kiss. "Do you have any specific plans for her?"

"Not really, but—she noticed lifeforce on her own. That's someone pretty interested in magic. And she's the first other metamancer I've known so I kinda feel—kindred, you know?"

"I understand and I am glad you found someone like you. How impressive is it that she noticed lifeforce on her own?"

"Very. Remember when immediately after you told me about it I had to stare at you for a while to find it? Finding it accidentally implies she was looking which says good things about her priorities."

"Oooh, that sounds like a great candidate for someone to be in cahoots with."

"At the very least she'll be a good person to help us reverse-engineer stuff."

He finishes writing his note, folds it into a paper airplane, and blows air into it, causing it to take off into the distance.