"Dave Arneson decided to begin a medieval
fantasy campaign game for his active Twin
Cities club. From the map of the "land" of the
"Great Kingdom" and environs -- the territory of
the C & C Society -- Dave located a nice bog
wherein to nest the weird enclave of
"Blackmoor", a spot between the '''Great
Kingdom" and the fearsome "Egg of Coot".
Gary Gygax, Introduction to D&D, 1 November
So it seems that after countless hours of writing & back breaking fan work 'The Hidden in the Shadows' blog is done with their fan project of 'The Weird Enclave of Blackmoor'. This is a fan project of placing & fleshing out of Dave Arneson's Blackmoor within the realm of Greyhawk according to the one hundred & two page project's introduction ; "This book presents an overview of Blackmoor for Greyhawk players; it's major places, people, and events. The goal of this book is to provide just enough detail for the Game Master to build adventure, while avoiding the mind-numbing text dumps too often found in sourcebooks. The information is not intended to be thorough or highly detailed, but sufficient to provide a Game Master with just what is needed to run a Blackmoor campaign grounded in tradition but allowing for creative freedom and imagination. It is a framework upon which many different styles of dress may be hung. It is system neutral, so it may be used with any ruleset, and it is adapted to the Greyhawk setting so that Greyhawk referees will have access to the wealth of Blackmoor material in a familiar and readily useable way."
'The Weird Enclave of Blackmoor' takes the veil back on the region of Black Ice & then doubles down by giving a solid overview of the region, its NPC's, areas, major powers, and even how the technological devices of the 'City of the Gods' fits into the Greyhawk area.
But the fact that 'The Weird Enclave of Blackmoor' ties directly into The Greyhawk box set & campaign setting is the icing on the OSR cake.