After Heirmund quickly translates Jair's words--using up more than the one minute's time given, he's certain--Durnn slowly lowers the longsword he was holding effortlessly over his head. He then responds in goblin "This is the deal you offer me?" He mulls it over for what seems an age, and then slowly begins to grin. It is not a pleasant sight. "I accept your offer! Come with me. But should you so much as blink without my permission while passing through my home, I will kill you. Or worse. I will leave you alive to be fed to the Tree."
He then barks a few short words at his tribe, which Heirmund translates as orders basically telling some of the Durbuluk to precede you all, some to follow, and threats of severe violence to the first Durbuluk who attacks without provocation. A few of the guards, plus one goblin dressed in warpaint and animal parts (teeth, feathers, claws, even a few skulls), watch you warily during the few moments it takes to complete the preparations.
Then Durnn himself leads you down the long, wide, smokey hall toward a door leading north. On either side of you as you follow are large stone columns marching in step, entwined with carved dragons. The door opens onto a much smaller hallway, which he leads you down and turns left before ending up at another door. You have time during this short walk to get a more accurate estimate of the goblins facing you: there are seven total hobgoblins surrounding you, and nine goblins.
He opens this door to reveal a 40-foot-diameter domed chamber. A wide circular shaft pierces the floor of this chamber, from which dim violet light shines, revealing sickly-looking white and grey vines coating the shaft's walls. Four torches set equidistant around the periphery of the chamber supplement the light from the shaft. A crudely fashioned throne of stone sits against the curve of the northeastern wall, and a large iron chest serves as the throne's footstool. A sapling grows in a wide stone pot next to the throne. Another door leads south out of this room.
Durnn turns to you, his grin still in place, and explains (again in goblin) "You will have to climb down, but the vines make this simple. They are safe, and will easily bear your weight. Go now, and leave your prisoners here. You will not be harmed by anyone here while you do. You have my word." His grin widens.
Despite appearances, Ydyr and Lehko can't find any deception in him; as far as they can tell, he is telling the truth. He's just not telling the whole truth...