Yoon-Suin is a campaign toolbox for fantasy games, giving you the equipment necessary to run a sandbox campaign in your own Yoon-Suin - a region of high adventure shrouded in ancient mysteries, opium smoke, great luxury and opulent cruelty. 

It contains:

• A bestiary of unique monsters, including self-mummified monks, liquid golems, tiger-beetle men, figments, and dozens more
• A new character class, the Crab-man
• A chapter for each of the major regions of Yoon-Suin, filled with random generators to brainstorm map contents, social groups, and more
• Extended rules for poisons, tea, opium, trade, deities and so on
• Extended rules for exploring the Old Town of the Yellow City, and the haunted jungles of Lahag
• Many encounter tables
• Well over 100 pre-written adventure locales to populate a regional map
• Over 300 pages of content
• Purple prose

What people have said about it:

"Yoon-Suin remains for me the original OSR setting and a huge inspiration." - Tom F

"One of the most original and fully-realized settings period in DIY D&D or otherwise." - Zak S

"This is probably one of the most impressive gaming supplements (let alone campaign settings) that I’ve ever come across...I can’t recommend this enough: this is a must-have for any DM or game designer. It is a fantastic work." - Necrozius

"My mind is blown. This artifact...is a labour of wonder. It is as stepping into a very idosyncratic storybook, with step by step instructions on how to have a magical adventure within. It is 300 pages of love, allowing endless adventure." - Hack Slash Master

"Beautiful layout and writing. I recently played in a campaign of this and loved it." Fraser S

"The most fully-realized tabletop role-playing game supplement I have ever had the pleasure of owning. And I've owned a few in my 35 years of tabletop gaming." Forrest A

"An almost overwhelmingly creative book." Evan