Kinda cool concept except... awfully executed.
Feels like 300-odd pages of mind-crushingly tedious game mechanics , it even spends a couple pages explaining what a roleplaying game is. You know, because you might buy an RPG and not know what one is...somehow.
Massively detailed pantheon... huge number of vaguely described cultures...
Having done all of that, it very very lightly skates over the actual setting (if you bought it for the cool villages-on-the-back-of-a-turtle thing, yeah they get about 300 words).
You wind up with only a very vague idea what a game might be about, like, various kinds of extra dimensional monsters bursting into our reality... seems to be pretty much what it's built around.
Actually ... that's about one adventure worth of content in 300 pages of mind crushingly boring detail...
And in all that there's like four kinds of monsters ... and all of them <spoilers> Evil Spirits or people possessed by Evil Spirits (ok maybe one giant spider).
And not even detail that's fun to read, like the magic system says you can use magic abiltiies in way that "creates a combat advantage"...<cricket sound>.
Nice idea, awful sourcebook.