"Art" isn't really a gob thing. The Engineer, however, can read and write. A useful human skill. For humans.
Assembling your group around a crude table provided by Ninetoes from his private den, the group patiently sits whilst you stand. The woman is still hobbling from her missing toes, and shoots daggers at Ninetoes before- eventually- volunteering a bit of information. Her torture has taught her that good servants live longer and healthier.
"There's a...small city a couple days away from here. They're called...Ankles. That's what everybody else calls them, anyways." She says, looking stricken at saying "Everybody else". She looks down at the table, "They've got such a beautiful system set up there, I've heard. So many lights and colors, streets paved with brick- real brick!"
The bugbear chieftain grunts, "Human city? Got raided by them. Fight hard, led by big noble. Shiny things interested him, were raided because tribe smashed their wagons."
Not the most literate answer, but a start, at least. Ninetoes looks at the human engineer, idly scrawling something on the table with the tip of a jagged stone knife.
"Ah, but you aren't telling the Glorious One everything..." He said, a note of menace in his voice. She let out a small sigh before continuing.
"The city keeps a small fort a day's journey away. Four days from here to the fort, and five to the city. It's a light garrison, from what I...what I know."