He can look at her spellbook and copy the spell if he likes but even wizards trained in the same paradigm can't use each others' spellbooks interchangeably, they have different shorthand and different diagramming, and that's probably worse if they're from different worlds. She is happy to try to explain.

He could copy the spell page exactly but does not think he would be able to use it without being able to understand what is written. He seems utterly unfamiliar with certain basic concepts, when he asks questions, but the enthusiasm is familiar; he acts like a wizard, when confronted with an unknown spell. After an hour of discussion he tries to cast the spell, without having written anything down, and cannot. He thinks there must be many very unfamiliar parts to this, perhaps built on unfamiliar foundations. What is the simplest spell she knows, maybe they should start with that and see whether that is comprehensible.

Right, that makes sense. She can start him with prestidigitation - not even with prestidigitation, with a sliver of prestidigitation, less than a cantrip, the slightest thing magic can be. If he has ink she can make a spellbook page of it.

He has ink and parchment and would be delighted if she could do that and explain what she is doing.

Then she will walk this very powerful wizard through the simplest possible sliver of a cantrip, trying to explain exactly what she is doing. The diagram tells you how to channel the magic, and once it's prepared then you have it at your fingertips but have to do an additional motion to actually cast it, and then cantrips are the set of spells where you can catch the magical energy back up in the same form once you've cast it, which lets you do it repeatedly if you'd like, but that's a trickier skill and they should focus on getting it at all first.

Then he will try to do what she says and try his best to channel the strange foreign magic.

It takes them most of the afternoon but he picks it up. She hopes that learning a new discipline of arcane magic isn't nearly the same thing as starting from scratch, that'd be really frustrating. Probably not. Most apprentices don't pick up cantrips on their first day of trying.

One he has it he can practice making things change colors and practice catching the magic after casting it.

He will practice this well into the night, whether she stands by to help him or not. 

"It's very different in structure from ours," he says, in between incomprehensible muttering to himself. "Like trying to work our magic without knowing what a rune is. How fascinating."

"There was an ancient empire in our world that did runic magic but I don't know very much about it. I think there are lots of frameworks that could work and this is the one my people learned."

"Fascinating."

In the days that follow, Hauskuld will be interested in learning as much magic as he can from Carissa, provided that she is willing to continue teaching it.

She would like to get something for it but she's still not sure how things are done around here and she doesn't want to make the powerful wizard mad and it's not giving up that much in the way of options, to teach him the rest of the cantrips she knows and then Mount. 

She does ask for extra ink and paper.

He can give her extra ink and parchment.

When the harvest is over, he informs them of this, and declares that his foster son Grim should escort Carissa and her companion to Reykjavik. He offers them two cloaks, one red and one deep blue, and some bread and cheese to keep them fed until they reach their destination, and two horses, if they would prefer not to have several Carissa's spells tied up in castings of Mount.

"Thank you. I enjoyed my stay here. I hope the magic of my world will serve you well in your research."

"Thank you! I wish you good fortune on your errand, and I hope to see you here again, in time."

"In a year, maybe." If the princess doesn't kill her. Or take her prisoner. Or just ask very nicely for her to go to Norwegia - Norway, it's called Norway - and present herself to the emperor, which she very much does not want to do while she knows this little but will probably not outright refuse. 

They head off.

The ride can be made in three days by ordinary horses that do not disappear after a number of hours. It's colder than it was before, but they have Endure Elements, and also cloaks, now, which help somewhat. 

Reykjavik is a slightly larger farming village, consisting of about a dozen longhouses hugging some hot springs. There are some ships beached a ways away from the sea.

There are really not a lot of people on this island. There are enough that the princess can definitely kill her, though, and beyond that she is not sure it matters.

Hopefully Grim knows who they should be introduced to here?

Grim greets a woman between them and the longhouses. She is guiding a horse with a wagon attached to it, transporting some large dead animal behind her. (Carissa may or may not recognize it as a dead walrus.) She has a bloody spear slung over her shoulder, and an unbloodied sword at her side. 

She greets him back. "Welcome to Reykjavik. Where are you three coming from?"

"We're from a place called Cheliax. It's very far away." She does not particularly glance at Korva while saying this so she does not notice any reaction Korva has to this person.

That's good, because Korva is kind of freaking out, and while she is trying very hard not to give any outward sign of it, she is not entirely sure that she's succeeding.

It's Zara. She's ten years older and wearing local clothes and riding a horse and dragging some kind of horrible slug-animal behind her, but it's Zara. The face and the voice are unmistakable. 

She is not sure exactly what is happening but she suspects that she is probably in incredibly deep shit of some kind.

The girl rounds on them curiously. "Very far away in what direction?"

"We don't know. We got here in a magic accident. Cheliax should be south of here but some people have told us it isn't."

"What sort of magic accident?"

"We were Teleported or Plane Shifted or something out of the street and to a random bit of farm here."

"That sort of thing happen often, in Cheliax?"