Drusk face brightens and he snaps his fingers.
"You must be Vanja, the person we met many moons ago, except using magic to disguise yourself as a tiefling."
He is quite smug at having remembered someone he only met very briefly, back when he was fresh out of the elven acolyte academy and checking out the Cottage on the Long Road.

(That is almost certainly not the right answer, but Drusk wouldn't have remembered even if the Int check was higher.
Probably better to provide a link to the old campaign thread and see if Guiltysparc or DirtyDogP want to make a guess.

)

"That's a cat, not a rabbit," Feldspar says, peering at the newcomer. 

The woman tilts her head at Drusk’s assuredness. “I do not know who that is,” she says. Fanny hovers in the hallway, still unsure how this is going to go, given Jorin’s armed stance.

The woman clears her throat, glancing dismissively at Jorin’s weapons, then glancing at the others, her gaze stopping a fraction of a second longer on Spar. “Yes, you seem to be the right ones. Grandmother was very descriptive in her story about you. My name is Mary Greymalkin, and Mavis Brinarei was my grandmother.” The cat blinks lazily at you, then begins licking a paw dismissively.

(Here’s a pic of Mary, you’ll have to add horns and make the cat tortoiseshell, as I’ve retconned her as being Mavis’ granddaughter, and Mavis was a tiefling and had a different cat. Pic in spoiler to save room.)

Feldspar thinks of whether she's ever come across either of those names. (d20 roll? Int/History is +1: 6)

She's still observing. Unsure of this arrival, her place in the group, and when Mary says "right ones" she looks at Jorin, Hildi, and Drusk.

Once the teifling walks in, Jorin would relax his stance and stow his weapons.

I think this is the Teifling from the very first adventure?  Or maybe her daughter?  That we met at the roadside tavern and then helped her clear out the hidden dungeon under her house.

(Mavis–or rather Mrs. Brinarei–was the elderly tiefling wizard who joined you for the exploration under the cottage in that very first gathering adventure. She did not continue with the group. She had a cat familiar named Mortimer. This cats looks like that cat.)

Hildigrim looks up from smiling at Mortimer at the word "was". His look of pleasant recognition falters. "'Was'?" he asks. "Is Mavis ... ? Is your grandmother no longer on this plane?" This however vague reference to an afterlife is a subtle indication of Hildi's feelings, given his usual atheistic stance. Or perhaps it's just something he's picked up from his family. His eyes quickly glance about her person for any books he might recognize before returning to investigate the tiefling's eyes.

“Yes, Mavis died last year, shortly after returning from her adventures,” she shrugs. “In any case, my employer is looking for some… um, brave heroes to undertake a quest to… ah, whatever. He needs fools to go on a high risk, low reward search to save Waterdeep. You are Hildigrim, Drusk, and Jorin. And…” she looks at Spar again, “Whoever you are. Don’t disappoint me.”

She narrows her eyes at you, stands up straight and tall. “I am formally inviting you to an audience with the Cartophile.”

She turns to stare expectantly at Hildigrim. Mortimer, the cat, stops licking and turns his eyes on the halfling, too.

Drusk eyes the cat.
He knows that birds don't react to hot peppers, but he suspects cats do.
Best not to feed it any of Pascal's leftover lunch specials. Maybe some of the salted nuts at the bar would be okay.

"Our newest companion is named Feldspar.
Being hired for a quest to save Waterdeep sounds interesting.
But I don't think we need to meet someone who really likes carts. The restaurant is only been in business a few weeks, so any thoughts of selling street food is premature."

Mary turns her gaze on Drusk, narrowing her eyes, clearly trying to figure out if he is making fun of her.

10

She doesn't seem to come to any conclusion.

Quote from Mingofaust >>

Mary turns her gaze on Drusk, narrowing her eyes, clearly trying to figure out if he is making fun of her.
10
She doesn't seem to come to any conclusion.

(That's the problem with a half-orc with a CHA of 8 being raised by passive-aggressive elves.
A skewed common sense and a whimsical sense of humor can create confusion.

Hopefully someone points out that Cart-o-phile is a name, and not a title or description.)

Drusk has an innocent expression and a goofy grin, waiting to hear what the rest of the party thinks.

"Who is the Cartophile?" Feldspar asks. "Your employer?" 

(Has Feldspar ever heard of the Cartophile?)

(If I have not communicated with you about the Cartophile in a private conversation, then you do not know anything about the Cartophile.)

Mary shakes off her uncertainty about Drusk and levels a withering stare at Spar. "Yes, I've said this."

"Yes!" Hildigrim almost bellows. When the others look at him, they can see he is practically dancing on his tip-toes. His face is full of wonder and glee and ... hunger? He is wringing his hands like he is looking upon the most glorious spread of a meal that could ever be served. "I mean ... " he says, trying to regain a little of his composure. He takes a quick step forward. "Are you truly here on behalf of the Cartophile?" Without waiting for a verbal response, but clearly seeing some kind of affirmation (even if imagined) in the tiefling's face or posture, the halfling dives past Mary and through the door. "I'll go pack!" he yells back. "Be right back!"

Jorin leans against the wall and folds his arms over this chest, "You speak in an overly familiar tone and offer meager reward.  You also seem unmoved by your grandmother's passing.  She was a good and brave woman.  What is your deal?"

Feldspar sees the withering stare. Challenge accepted. She returns with her own withering stare. 

(Charisma skil check?!?!?): 18

Mary slides out of Hildi's way as he races out, her floating chained items neatly dodging out of his way. She seems pleased, as she turns back, ignoring Spar's glare, and focusing on Jorin's nonchalant digs. "Mm. Yes, well, if I am to accompany you on this journey, a 'familiar' tone seems appropriate. Grandmother and I had a relationship without much depth. My deal, as you say, is that I will help you complete a job for the Cartophile, save Waterdeep," she rolls her eyes. "And, perhaps, discover the answer to one of the great mysteries of our age. Have I answered your prying questions? Please, ask more."

Without waiting for an answer, she turns to take in Fanny, who is still hovering, and imaginary puff of smoke lingering where Hildi raced off. "I will be downstairs to take you to speak to the Cartophile today. We will leave tomorrow on the journey."

She moves to go down the stairs, and Fanny looks to you all with questioning eyebrows and a helpless shrug. Mortimer follows, stopping to glance back at the rest of you before continuing on with Mary.

(If nobody stops her, she will go downstairs, as will Mortimer, and you can discuss, wait for Hildi, go downstairs yourselves, or do something else!)

FYI, it is midday.