Human: Write a detailed description of a eerie scene inside a cave cavern with a purple stall and billowing sheets. Assistant: 
This corner of the market runs up along one of the cavern's walls, the black stone inscribed with old Imperial records but the glyphs long since obscured by crude graffitti and chiseled obscenities. A large stall stands nearby, its billowing sheets woven of purple thread instead of grey like all the others, and the locals give it a wide berth.