I love this adventure! It's got all of the elements that make for a fantastic, fun time. Flying gorillas with big ass falchions? Hell yes! Ancient tech magic? Ah, yeah! Undead spellcasters? Gimme more!

I got a distinct "At the Mountains of Madness" meets Robert Jordan's The City that Waits and Machin Shin (The Black Wind) from his "Wheel of Time" series on the set of Jurasic Park vibe from this module. I LOVE those elements.

Can't wait to run this for my group. This is one of those adventure that you pick up and start reading and 2-3 pages in you want to run it immediately. Definitely pick this one up!

I really wanted to love this adventure but it was a little disappointing. However I did get some good ideas off of it. I'll share some thoughts below so here's a spoiler warning...

Likes:
-The idea of the Aeromantic Infantibulum, an arcane engine for the floating city is fun and really evocative of some lost race of great power.
-Fiendish monkeys. That explains itself.
--The Derhii were cool, I think I would have liked them earlier in the story though, maybe switching them with the Lizardmen to gain information and plot development.
-The 'Seven Mysteries' sidebar and '10 Creepy Chaos Elements' were inspiring and helped flesh out the city and add some eerie atmosphere.

Dislikes:
-I didn't like the idea of the three cultist spellcasters, they just felt redundant.
-Overall my biggest problem was a disconnect with the danger of Chaos in the adventure. It was this force that destroyed the city and it's citizens but as the villain, it's almost an afterthought. Perhaps because the Shoggoth is more of a plot tool than the BBG that terrorizes the city. The cultists seem much more important than anything Chaos related.

An excellent adventure. I was rather worried having read Spires of Xin-Shalast that there was no way one 32 page module could live up to the high standard set by it. I was happily proved wrong. The module is full of atmosphere the valley the adventure is set in is well detailed, it feels like a realistic isolated environment. I like the way this valley is isolated enough that it could be placed anywhere in a homebrew campaign. I do wish that they had made some mention of where in Golarion the adventure is supposed to be set.

All in all this is a great module. The writing is really good, it can be easily dropped in to any campaign and the art. I feel I should make special mention of the art as it is exceptional. I think Ben Wootten who does a lot of the interior art may be my new favourite artist at paizo. His work in this module is great. To conclude a must have module.