Some neat new scenery in this episode. I have a lot of questions about their culture. Are they never visited? Are they tribal and living in ancient times, because they didn't seem to care two modern ponies met them. They seem to have an economy of their own... which makes Equestria a really strange place. There are cultures within their domain that they sort of don't recognize and they are autonomous. Their modern technology hasn't expanded to everyone nor does it seem like they are trying to impose their will. They live in uncharted territory, but do they leave their territory? Do they get visitors? Why have they chosen to live their own way still and no expand or make outside contact? Or maybe they have outside contact but since they didn't talk, no one tried to push it. It's just very strange.
My next big question is... I want to know more about Kirin. They obviously have some sort of magical powers. When they get mad they turn into demonic creatures with immense power... and thats scary. Maybe they are purposely kept in this mountain valley?
They are ritualistic and believe in different things then most Equestrian's. Where does this dangerous water that causes ponies to go mute come from? Think about how dangerous this is and what other dangers lie in there valley? An explorer could find this running water and drink it unknowingly... sheesh.
Autumn Blaze is awesome by the way. I love her characters.
The ending was abrupt, but complete. Good episode! 8/10.