In my current run, I freed Halsin before doing the Shadwo Druid Quest. Now Khaga just stands around and says "Peace enjoy it at long it last". I can't find a book by the tree that connects you to the Shadow Druids. is that a bug?
Or did I forget something? Are there any new options as a druid?
Kagha seems poised to stage a coup against Halsin with Olodan's help some time after you leave the Act 1 area (possibly in the ending slides after you complete the full game) if you don't expose her. It's kind of lame, a punishment for not paying enough attention in my opinion.