Somewhere? None of them seem to know where he lives, just that he frequents the Fortune's Wheel.

Well, is he around?

Not in the main bar, but he could be in the gambling area or the bear-baiting pit. 

Investigation!

She will eventually find him in the middle of a dice game. He's insulting the other players with personalized, spontaneous songs. 

It's kind of cute.

He finishes up and retreats with his winnings. 

"Hey! We heard you know something about the Draedens?"

He squints...probably. Mephit features can be hard to read for people who are used to faces with distinct features, since his are obscured by the smoke billowing from his entire body.

"A little louder why don't you. Who are you with?"

"It's always faction this and faction that in this town. Nearly sucks the fun out of the whole enterprise."

"Faction, pit fiend, lost prince of the whatsit clan of the who-cares kingdom. Someone sent you or you're right addled. You don't want to go there."

"Why not?"

"Why not, she asks. Not why, which is the better question. Why not go somewhere that isn't tied to gluttonous enemies of the gods from before there were tieflings, no she asks why not. Because it's boring, ma'am. It's nice to mention when you need an overly large bodyguard to leave you alone, because his superiors will eat it up, but it's not very useful."

"Useful is as useful does."

"Well, you're charming enough to offset your friend, and charming is a terrible reason to share information, but then I'm a terrible person. Giant maggots, in an empty void. Possibly, young Draedens."

"Where's the gate?"

"Demiplane, not plane. You'll have to visit the Ethereal for this."

"Bit of a trip, isn't it?"

"Boring, not useful! I need something to tell people at parties! If you're going to kill me I recommend waiting until I'm finished my latest delivery."

"Why?"

"The Mercykillers don't like mephit incompetence, but they take interference worse."

"On your way, then."

"Best of luck with whatever other dangerous things you have planned. Don't tell the Draedens I say hi." 

He flies away.

"So I guess that's a bust."