Got through the Backerkit Advance copies. This setting guide is a TRIUMPH, and can integrate well with different systems; I like Mythras, or even Ironsworn or Circle of Hands with it, but I think people could get funky with the setting in different ways while still being faithful to the setting the guide describes. This is immersive, well-executed, politically-thoughtful, and so historically informed--a huge thank you to everyone who worked on this!