|Owen K. C. Stephens Modules Overlord|
Is this a 3rd party product? I wanted to craft myself a few cyclops helms, but the PFSRD has it listed as being from a 3rd-party product, which our group doesn't allow.
It's published by Paizo and Goblinworks together, with authors like Lisa Stevens and Erik Mona. Your group is going to have to decide if being an official Pathfinder Module, published by Paizo in cooperation with another company, and being set in Golarion proper is good enough for your group, or if any involvement by a not-Paizo group makes it a 3pp product in their opinion.
From the first page:
"Pathfinder Module: The Emerald Spire Superdungeon is a joint publication of Goblinworks, Inc. and Paizo Inc. Pathfinder Online is a trademark of Paizo Inc, used under license. Goblinworks is a trademark of Goblinworks, Inc.
Pathfinder Module: The Emerald Spire Superdungeon © 2014, Paizo Inc. All Rights Reserved.