"What its limitations are, how it can be learned." 

"Ah. Well, there are different kinds of casters, with different limitations, but the eight schools are common to all of them - conjurations create or move things; transmutations change things, like reshaping stone to make a bridge, or sometimes in subtle ways, like Eagle's Splendor changing your mind to work slightly better; divinations give people information, like the translation spell that lets me know how to speak your language; illusions make false images or sounds or other tricks of that sort; abjurations protect the people or things they're cast on; evocations create energy, for example in the form of a bolt of lightning or ball of fire; enchantments let the caster affect peoples' minds in various ways; and necromancy allows the caster to raise and command undead and affect peoples' bodies in various ways. We can do some things that aren't obvious from those descriptions - healing is a type of conjuration, for example, because it often creates flesh - but anything very different from them we're unlikely to be able to do."

"For a directly-cast spell, the caster has to be there to cast it - some require touching the person or thing we're casting on, others can be done at a bit of a distance, but almost all of them require the caster to be there to set the target when they're cast. It's also rare for a spell to last forever, if it's directly cast; most last seconds to minutes, some last hours, a very few last days. It's possible to infuse a spell into an object, to get around these limitations - my translation necklace, for example, will work forever unless it's broken - but that takes special training, I don't know how to do it."

"All casters from my world have limits to how many spells we can cast per day, and most of us have to prepare our spells ahead of time - the exceptions to that are mostly not types of caster that you can choose to be; sorcerers get their magic from their bloodline and favored souls are rare, and spontaneously chosen by the gods. Bards are another exception, and one you can theoretically learn, but they aren't strong casters and I think you'd be poorly suited to the profession in general - they're generally very focused on interacting with other people. All three of those have limitations on learning spells at all - I can only cast Eagle's if I've prepared it, but if I choose not to prepare it I can ask for any other spell Fharlanghn offers instead; if a favored soul knows Eagle's and two other second-tier spells, they don't have to decide ahead of time whether they'll want to cast Eagle's that day and risk wasting the spell slot, but they also can't cast anything but those three spells, or their first-tier ones or orisons which are similarly limited, with their second-tier slots."

"Generally people who just want magic in particular go for wizardry; it's the most straightforward that way, and the most versatile, in theory. I can't teach it, but there are plenty of schools in my world that do, if you have the aptitude; it's based on cleverness, how good you are at solving puzzles or inventing things. Wizards construct their own spells, rather than receiving them from an outside source, and are about equally good at all eight schools, though they've never figured out how to do healing in particular."

"Clerics are also strong spellcasters, but if you're just interested in the magic, you won't be able to get it this way - unless you're interested in magic because it sounds like the best thing, for its own sake, in which case you could be a cleric of the god of magic. We get our magic through devotion, to our gods and the concepts that they're made of, or to concepts that are important to us personally without necessarily having a god involved at all. The concept has to be the most important thing in your life, something you wouldn't be yourself if you didn't care deeply about. If you have something like that, you can do a little bit of preparation - every cleric needs a holy symbol," (he touches his), "- and then spend an hour a day at the same time each day in prayer and contemplation of it and how you relate to it, and you'll start getting magic. Assuming it works here, I suppose. We can't cast as wide of a variety of spells as wizards, but we do get healing, and a variety of defensive and utility spells, and some offensive ones - I can translate a list of common cleric spells for you, if you'd like."

"There are also druids, who are like clerics but devoted to nature; they get more spells that help them interact with the natural world and less that help them work with other people, and they can also transform into animals. I don't think you're suited to that, either, you seem too comfortable here rather than out in the woods."

"Did I miss anything that you wanted to know about?"

"Nn." 

"All right."

He's up bright and early the next day for the trip to Koi Tower, wearing a backpack and carrying a different walking stick than he had yesterday.

Xichen does not notice the difference, looking somewhat preoccupied. 

Today the cleric of the god of travel gets to learn what it's like to travel by flying sword. 

Excellent, is what it's like to travel by flying sword, if a little cozy.

They arrive shortly outside a grand tower surrounded by a number of lavish outbuildings. 

Raafi's a little distracted by the architecture, but only a little.

"Is there anything I should know before we go in? And I have spells for us, too - Owl's like I cast for you yesterday and Eagle's, the one that helps with communication, at double the duration but I don't know if there'll be a wait before everyone else gets here."

"At least a short one; how long do they take to cast?"

"Only a second or so each, it can wait."

"Er-ge!" a short man in a hat designed to make him look taller says, stepping out of the tower and beaming at Xichen. "And--who might this be?" he asks, nodding at Raafi. 

"This is--someone extremely foreign, who has abilities that bear little resemblance to conventional cultivation. And even less to demonic cultivation, of course. But A-Yao, there is something I really must speak with you in private about first." 

"Oh?" 

"In private, A-Yao," he all but snaps. 

"...Right," he says, smile fading. He turns to the other visitor. "If you wouldn't mind waiting, I can show you to a room where you can do so comfortably." 

"Of course."

He leads him off to a comfy waiting room and leaves with Lan Xichen. 

These people have excellent silencing spells; he doesn't hear any shouting at all. 

They return a little more than half an hour later, Jin Guangyao looking a little upset and subdued and Lan Xichen looking unhappy and troubled.

Raafi looks from one to the other. "...is there anything I can do?"

"No. But thank you." 

"All right. Uh, names - the title for clerics of Fharlanhgn is 'Traveler', my translation magic is struggling with my name a bit but 'Traveler Raafi' sounds at least more correct, to me, if you'd like to introduce me that way. Or just 'Traveler', I'm addressed that way often enough at home."

"Traveler Ruafei," he tries.

"Sounds good to me," he nods.

Then they can go in and see a man in elaborate golden robes who is lounging on a very elaborate chair and not-so-subtly perving on attractive female servants while his wife glares at him. 

The man is initially skeptical but he's willing to have Raafi's impossible outworld magic demonstrated and once it has been he is suddenly paying MUCH MORE ATTENTION and yes would very much like his son (and daughter-in-law) back and yes they have diamonds. 

"I'm prepared to do that today," Raafi nods. "I'd like to know a little more about them first, though, on general principles - what they were like, how they died, that sort of thing."

Jin Zixuan was honorable and brave. Jiang Yanli was kind and gentle. They were both horribly murdered by Yiling Laozu.