BTW, I put together the next encounter, and I guess I'm gonna go ahead and run it while you're doing your thing. Here it is:
- Gnoll Huntmaster (Lvl 5 Arty)
- Gnoll Demonic Priest (Lvl 4 Cont)
- 3 x Hyena (Lvl 4 Skrim)
- 2 x Hellhound (Lvl 6 Brute)
To the extent that this game has a story, it's this: Tailen is an ambitious drow noble who finds a talented group of slaves (that's the PCs, obviously) and exploits their abilities in order to build herself a little empire in the fey city of Harrowhame. To this end, Tailen sees her chief competition as her half-sister Nymeria, whom she hates out of typical drow racism and suspicion. But, this being a drow story, Tailen's suspicions are well-founded, especially given the fact that Nymeria's father Malakus is a powerful demon with no real ties or loyalty to Tailen's House. That brings us to where we are today: Tailen has sent you on a mission with Nymeria. Ostensibly, you're supposed to just watch Nymeria, but Tailen hopes that things go south, and either you kill Nymeria or give Tailen herself an excuse to do so.
However, Nymeria is not stupid. She knows why you're on the mission and wants to kill you as a way of striking at Tailen. In the short term, she's hoping that the dragon or its minions will do it for her, but in case they fail, she's also recruited some of her father's followers to dog your steps and kill you if the opportunity presents itself.
And again, that brings us to where we are now. Once you finish fighting the kobolds and start going about looting the cave, you'll be ambushed by the gnoll group above. I plan to re-skin the Hell-Hounds as demonic monster hyenas or something, but in any event, that's the plan and the monsters that will execute it.
Then, when you emerge from the cave, you'll see the caravan has pulled back, leaving you alone and somewhat exposed against an entire clan of kobolds--and gnolls too, as it happens. That should be enough to start some suspicions on Nymeria, but of course, there won't be any proof, and she'll be just as imperious and demanding as ever once you get back outside.
Beyond that, I'll just say that I spent some time this morning searching through the Monster Builder looking for demons before eventually deciding that most of the really cool demons were too high in level for this party. I almost went with Mezzodemons and Evistro Demons, but then I'd have had to give out enough Quest XP to bring the party to 5th Level, and honestly, I just didn't feel like doing it that way. So I fell back on gnolls, who tend to worship demons. It's kind of a tenuous tie, but I think it can be made to work. And in any event, a little mystery is probably not a bad thing.