So they teleport to Minagho's hide out, well their teleportation goes awry so they need to spend some time journeying to it, and slowly slaughter the demonic inhabitants. They do leave the cambion alive when he makes a deal for his life. He is an alchemist whose worked on the Nahyndrian crystals, after all, so he seems useful to them. He's also labouring under the delusion that they are Lawful Good (rather than Neutral Good and Chaotic Neutral) and that they'll obey their oaths to the letter (not truly understanding how lawful humans can adapt).He gets charmed by Minagho (luckily they spot it and don’t figure it for a betrayal) and fights on her side until he's injured. Then he spends his time using cure potions and staying out of it until fully healed, by which time Minagho and the others are all destroyed. Then Queen Galfrey and her troops arrive and are disgusted by the sight of the cambion, but are willing to escort him to Drezen for interrogation.
Our heroes enter the abyssal rift while Queen Galfrey positions herself on the other side, and the two groups shove two pages from the Codex into the rift and chant it closed.I skipped a few of the battles on the way through the caves as they weren't all that exciting compared to what was upcoming and wouldn't have proven a challenge anyway. They reached the temple, correctly guessed the puzzle, and appeared in Alyshinyra.
We then took a few weeks off as I had a bit of a think about what I'd like to do there. After all, the book can't devote much space to describing it fully and truly and I didn't want it to feel like Cheliax for demonkind or only as strange as Kaer Maga. I think I did a good job, in the end. You can judge for yourself when I write it up next week!