From publisher blurb:
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.
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