I really enjoyed running this module for my table and they enjoyed it too. The final combat was very intense and it was almost a relief when they destroyed the flesh mote instead. I love the flameskull dragonchess encounter; it was awesome to see that gaming proficiency actually come into use.
There are two suggestions I would make for this module. One is that the undead caster villain could have used more of a backstory. I realize there was a time crunch that was important to the adventure hook but the nature of their enemy was not clearly understood and the party was left wondering why this all happened in the end. The second is that it would have been nice to have more concrete negative consequences for letting the faction agents die in the catacomb collapse. My party excercised their flaws to run brilliantly but in the end, everyone is just "oh you did what you could, thanks anyway." I'm going to try to work their failure to rescue them into a negative consequence in the following adventures.
[4 of 5 Stars!]