Fu -Leng is dead, the Shadowlands arevruled by the Daigotsu, Secrets of the Shadowlands is a great source of info.

Anyone that has the taint is shunned by the empire, though the Crab clan use the good ones to fight within the Shadowlands.

If your going to be hunting in the Shadowlands, besides jade you should be taking Kuni crystal aswell. The Goju (ninja linked to the Shadow Dragon the Dragon clan had it in a prison of crystal, well the Lying Darkness or The Nothing) family will make a mess of your day quick. The Chuda are the shugenja of the Shadowlands and are sneaky. The Tsuno are very nasty to fight.

But couldnt recommend Secrets of the Shadowlands and Crab and if your not Crab clan look at the Secrets of (clan name) book, one for each and a great reads