Underdark: City Gates of Gracklestugh

"The ground at your feet has been getting smoother and flatter, a welcome respite from the uneven passages to which you have grown wearily accustomed. Eventually, stone tiles become more noticeable, turning the path into a proper road. You can see spots of light in the distance, blue-white and too regularly placed to be phosphorescent mushrooms. The lights are proper lamps flanking two massive stone gates blocking the tunnel. Before you get a chance to examine the intricate carvings on the gates' surface, a harsh voice hisses from a slit on the cavern wall that was not therebefore. "State your names and business!" the voice orders in Dwarvish. Other similar slits open, revealing the tips of a dozen crossbow bolts. Behind you, a metallic din announces a group of six heavily armored dwarves appearing out of thin air, their swords leveled at you from behind sturdy metal shields." Made for a personal OotA (Out of the Abyss) campaign.