u/Ace-O-Matic

One of my friends is going to be running a bit of a kitchensink campaign, mixing a variety of planes/settings/etc. I'm helping filter for some sourcebooks, but I'm having a hard time finding a decent Eastern Asian one. Largely, because in addition to having decent balance, we're looking for something that provides subclasses and/or some extra variant options for existing classes, rather than relying on a bunch of new classes. Additionally we're hoping for something that introduces a minimal amount of new mechanics that are siloed off in their own system (EG, adding new weapon + masteries is great, adding a Tome Of Battle Martial Casting system is not).

Any recommendations?