Enjoyed reading through this one a lot. The theme is very inventive and the lore/introduction is very cleanly-written. That, along with the large variety of prompts in each scene description, both feel like they'd make it MUCH easier for the DM to prep and run. The only things I'd personally change are some slight re-ordering of mechanics to make it flow a little better. For instance I feel like the Fae powers section would have been better located in the 'Attacks by Fae adversary's section even if it is right afterwards. That said, flowing from that, I did also like the different conditions, it adds a nice little mechanical wrinkle to the Havoc Engine.