There are thousands of unique creatures, both large and small. This universe does not use much of the basic monster collections, instead it has its own set. In addition, elves, dwarves, orcs, and dragons are almost completely different. There are a lot of prestige classes in the Nine Sisters. In addition, there are a few custom classes, like the tanin, that fit the world view.
Feats There are actually fairly few new feats in the system.
However, there are a few to expand on some of the more specific rules and concepts in the system. Skills Like feats, there are actually few additional skills in the system. The ones that are added are expanded on to give more of the flavor the Nine Sisters represent instead of creating new rules for them. With the different world views and concepts, there is bound to be more spells and powers. Some classes were created from scratch, requiring new spells, while others were expanded on.