Boy, this site sure does love to eat posts, doesn't it? I'd try to write this stuff elsewhere, but copy-pasting is such a mess for the forums to handle. Sorry about the delay!
Room #6: Scrip
Proceeding down the left pathway for a while, you eventually come to a little room, and you get some GM text.
"At the end of the endless passage, you enter into a cramped chamber. Unlike the rest of the sewer, this part of the tunnels seems to have been modified from a natural cave, explaining its lumped, misshapen shape. Within, a strange kobold clad in furs watches you calmly."
Screenshot:
So first things first: Do not, and I can't stress this enough, do not attack Scrip (this fluffy little kobold's name is Scrip). It's really freakin' stupid, but if you kill him, even by accident, it's an auto-failure of the quest as if you killed two elders. I even checked with an all-stealth run to be sure—even if you havent killed a single elder yet, you fail if he dies. Extra unfair because they don't warn you, and because he's sitting on an explosive barrel, so all it takes is one misclick. You can't actually attack him,but if you attack that barrel, he dies instantly. Hes got like one hit point.
So Scrip is, from what I gather so far, essentially the villain of the series. The GM in me wants to scold SSG for putting the final boss in the same room as the PCs before they're allowed to kill him, 'cause you know that never goes well, but it's kinda cool that you get to talk to him, I guess. I just hope they give him more HP by the time it's time to fight him!
Here's his dialogue text, or as much of it as I could get (it's kinda tedious getting to him, so I haven't explored all these dialogue options in full). I underlined the ones that lead to him not being willing to talk to you any more (since these forums will not let me cross stuff out). You need to get through the whole conversation without ticking him off or the game doesn't let you find the secret door.
"Hey. Who are you? You not belong here."
[You don't look like you belong here either.]
"Huh. What do you know? We kobolds come all kinds of colors. You working for Storm Lords?"
[No, I just got... really, really lost. What's going on around here, anyways?]
"Not my, what is word? Business. Leechmaw got plans. Scrip just here to try to make sure plans not hurt other kobolds. You better stay out of it, get out now. Metal men should not go in sewers. Here, take shortcut behind me. Scrip do you favor, maybe you pay it back."
[Yes. They sent me here to see what Clan Leechmaw is up to.]
"Oho, did they now? Old Scrip's got nothing to say to you, mammal. Get out while you still draw breath."
[Who are you? Are you from the Leechmaws?]
"I am Scrip. Not from any clan. I go between the clans and make sure kobolds not fight each other, make sure kobolds stay strong. Try to see what Storm Lords are doing. Are you the one who went into Gnashtooth and Tunnelworms?"
[Yup, that's me.]
"Very bad. Was not our idea. Wasted time, wasted kobolds. Kids should not go in sewers. Gnashtooth and Tunnelworms very angry."
[You're being awfully calm about it.]
"It is alright you save kids, but bad you kill so many kobolds. Nothing is simple, Scrip always say. They send dogs down, chase kobold families out warren. Sometimes we punish wrong people. Burn the throne instead of king."
['They'?]
"Storm Lords. Very bad people. City force us to live in bad water, deal with slimes, send dogs down when we not do work. Your city is bad. Maybe soon the city pay the price."
[What's the Leechmaw Clan up to?]
"Not my, what is word? Business. Leechmaw got plans. Scrip just trying to make sure plans not hurt other kobolds. You better stay out of it. Metal men* should not go in sewers. There is way out in here. Scrip do you favor, maybe you pay it back."
[What’s it to you, lizardrat?]
[Close dialogue.]
*When I was playing a halfling, he said "mouse humans". When I was playing an elf, he said "knife-ears".
So here's the thing: There’s a secret door behind Scrip, which you can only use if you complete the dialogue with him. It leads to a grate that serves as a shortcut out of the sewers, but there's also a ladder that leads straight to the final room, so I strongly suggest you go that way. It's good to at least unlock the area!