The material presented was pretty good. I just feel like I'm unlikely to use some of the materials. Also, the system for determining what part of the body is hit doesn't really work.

This has some really fun ideas in it that I can't wait to play around with. The Warlock stuff is especially good and super flavorful. Plus anything that gives that class spell storage sounds great! My only issue with this is that it's too dang short. Not that the price isn't appropriate but I feel like we're just skimming the surface of what one could do thematically with masks.