Belmarniss can now sorta muddle along in the local common thanks to aggressive use of comprehend languages to hand-translate books after roping a local into teaching her the alphabet. Also she hates teleport traps with every fiber of her being. Also she has figured out at this point that she somehow leveled in sorcerer instead of wizard during the business with the pirates and has no idea why that happened or whether it will happen again. And she has sold this stupid arrowhead to two different curio shops and given up as it seems to be cursed. And she just needs to keep doing what she does, she guesses, till she can teleport herself home. The Yawning Portal is a nicely ironic name.
"Cavallas's peculiarities aside, do you have any questions for us, or should we go and attend to our duties?"
"You will be traveling through the Underdark, so... I don't like to say 'be prepared for anything,' because there's no such state. But prepare as best you can for umber hulks, enemy drow, driders, harpies, roaming undead, and various other hazards."
"You can reserve rooms for yourselves in the Lith My'athar public house free of charge, if you wish to rest, and there are merchants of arcane and martial goods in the market district. The guards on the western gate will be told to let you through when you're ready to go."
"Oh, yes, I was going to show you mine as well - we can repair to one of the side rooms, if you like, and trade spells? You might have something I don't, too."
They repair to a side room. Spellbooks are flipped through.
As she mentioned, Nathyrra's selection leans heavily into ways to kill things. However, she has a decent number of spells that are instead dedicated to preventing things from killing her, or getting close enough to kill things without being noticed. She also has a handful of spells that aren't related to killing things at all, but they're pretty thin on the ground.
Well, killing things is the order of the day. Nathyrra might like Belmarniss's anti-tripping cantrip root or the rite of centered mind or keep watch - "I'm out of the habit of using that because it takes two slots but I should get in it, it's first level".
"Keep Watch could be very useful, thank you. And Rite of Centered Mind sounds potentially helpful if I know in advance I'll be dealing with, say, illithid. I'm very steady on my feet, so I doubt I'll need Root - when I was training as an assassin, the slightest misstep would have meant certain death."
Belmarniss writes down evocations. "What have you got in the way of transmutations at mid level?"
Nathyrra looks slightly awkward. "I have Transmute Rock to Mud? Transmutations have never been my specialty, sorry. Gulhrys, the local merchant of the arcane, has a wide variety of scrolls for sale... at only moderately outrageous prices."
The party is in the market district, watching Deekin haggle aggressively with a drow lapidary who looks somewhat put-upon.
"-Deekin talk funny, but Deekin not stupid. Diamonds this good be hard to find even in Underdark. See clarity? See size? This diamond be Wish-quality. Name Deekin price for merchant, not for dumb kobold."
"Fifteen thousand, then," the merchant grits out.
"You hear what Deekin be saying about Wish?"
"Who do you see in this place who can cast Wish? I'm going to be splitting this into half a dozen low-carat jewelry pieces. If you want the full price then you can Plane Shift and pawn it in the City of Doors."
Deekin squints at the merchant and hums under his breath. "Twenty thousand," Deekin says finally.
"Fine."
Deekin hands over the walnut-sized black diamond they found in the ogre mage's desk, and the merchant hands over a sizable pouch, from which Deekin removes a single platinum coin for inspection. "Good. Oh, Belmarniss! Deekin be talking to nice lapidary."
"Hello, nice lapidary. You split up Wish-quality diamonds? Sometimes people who want to cast Wish are in a hurry and overpay."
"Nobody like that is coming through Lith My'athar," the lapidary says sourly. "The highest-level caster in town is the Seer's pet assassin, and she doesn't have ninth-level spells. If I were in Menzoberranzan I could sell it to one of the Valsharess's high magi... but if I were in Menzoberranzan the Valsharess would have long since appropriated my stock. Which is why I left in the first place."
Deekin nods. "Deekin sell rakshasa diamonds and other miscellaneous stones already. Lith My'athar very diamond-rich environment right now."
He hands Belmarniss a heavy purse. "Belmarniss's cut. Deekin also sell rakshasa sword to smith named Rizolvir and eyes to wizard salesdrow named Gulhrys."
Weighs about ten pounds.
"Yep! Belmarniss kept most loot out of everybody, Garrus get lots of cash to catch up, but even after Deekin do math to even up take Belmarniss get about seventy thousand. Deekin get it in platinum for convenience."