Excellent way to wrap up the Parnast story. I love how all the different stories connect together, and how you can find characters from past mods to help with the defense. It almost has a "Seven Samurai" feel to it, or "Magnificent Seven" if westerns are more your style.
That said, I'd like a little more DM guidance on running it as a mini-epic. I love that we can do that, but some tips on table coordination, dividing up tasks and combat, and so on would be really useful, especially for players who've never been part of an epic before.
I also kind of feel that the Mud Mephits from "Beneath the Fetid Chelimber" could have joined the defenses too, but I don't know how much help they'd really be. So that's a really minor thing. I also had no idea sparing Kagrota Threeteeth was even an option, I've never once seen her left alive.
Definitely challenging combat, so it makes the players work for their win, which I'm totally good with. Really nice item drop as well.
Overall, nicely done, ties together and concludes everything in Parnast very well. (How do things go with Wallace and Elspeth after it's all said and done, though?)
[5 of 5 Stars!]