What the Goblin Said

Lead by the half-orc Agamemnon, a small detachment caught a fleeing goblin ambush party. The leader of the goblins seemed proud, and only too happy to talk.
Italics denote the result of Aggy’s sense motive
 
“The mouth of doom? No. There are goblins there but weak, wretched things.  We don’t care what happens to them, too weak to join us and too stupid to be welcome in Mosswood (Probably True).
We come from Greznek. The most glorious city that you will never live to see! Tribitz is our high priest, he leads us in service of Orcus. (Certainly True)
We only come to the surface rarely. Human heads are a delicacy to some, and there are those who may journey up from the under-realms to barter for them. (Probably True) 
Getting There? Getting there is easy, but perhaps not so easy for you. There’s a river near the cost road that flows down. It’s two days walk or a half day finding a boat off the rocks and rapids, but there’s a hidden door that opens only to us! (Could go either way)
Good luck finding that one door in those miles of caves! There are many other entrances of course, but exploring is so dangerous, isn’t it? Our entrance hall is in the largest cavern in all of Rappan Athuk. Guards? No guards. Greznek is free trade for all! (Certianly False, goblin cities are usually friendly to only goblins and other similar creatures, despising surface folk)
Once it’s clear that the Goblin’s lie hasn’t been believed, he and the other goblins begin to shout about the entrance to Greznek being “lined with flowers”, “paved with gold”, “inside a [umbral dragon]’s tummy” and “frequented by your mother”
At this point, the goblins dissolve into fits of laughter, and all chance at rational discourse is over