While I help with the design elements of Netherworld, I also oversee the PC merchants, traders and crafters who are resident in the setting. In Netherworld many mundane items are available in the central market, however, specialist and magical items are only available for PC (and a few NPC) Crafters. However, there aren’t many times that adventuring PCs can get to Netherworld to order their new gear - so the crafters are also Merchant Venturers, travelling the worlds looking for opportunity …

You can find descriptions of their business holdings on the Netherworld Wiki.

Places the Crafters have visited include:

Hiyal - an industrial city in The Land of Fate (A cross between the 3rd Ed Al Qadim setting, and my home-brew version Sakar)