Lady Seong-In's Guide to Thoss is a series of system-agnostic setting guides designed for gamemasters, players, and creatives alike to explore a world of high fantasy and industrial technology. Each volume covers an area of the world of Thoss, typically no larger than a kingdom or city-state, and acts like a simple traveler's guide to the area. Brief histories, points of interest, major characters, supplementary info, and more can be found within each volume, along with rumors and plot hooks to give GMs a little push towards creating fantastical adventures in the setting.
This is a companion discussion topic for the original entry at https://rpg-trader.com/products/6285/lady-seong-in-s-guide-to-thoss-vol-1-the-temple-of-tam