Buntleby clears his throat modestly.
"Young miss, I hardly doubt your word, but I might suggest you have mistaken cause for effect. My researches have been somewhat extensive."
He indicates his reading desk, which the party can now see is piled with books on the history of Sharn.
(Veyk, Zook, and Rethlin should make a DC 15 Spot check here)
"The work I've found most relevant is actually somewhat obscure."
He holds up a badly foxed volume faintly titled
THE DOOM THAT WILL COME TO SHARN
by
ASH CLARKTON SMITH
"Smith clearly indicates the earliest settlers of Sharn drove off the indigenous goblinoids with unsporting methods. His unequalled translation of the Sharnape tablets clearly reveals the goblin shamans swore to return from the grave and slay all within the city of Sharn.
Most importantly, it describes the oath as 'into the dark you drive us, down where the sun cannot shine. Deep in the dark we will hunt you, and the blood in your veins will be mine."
Buntleby points up at the overhang shading the entire district.
"As you can see, we can scarcely get deeper in the dark."
(Zook and Veyk should make knowledge: arcane checks here)