It has been about seven years since I have seen this movie, so my memory of it is really vague. It was an older movie, but it was in color. There was definitely at least one young boy(?), and I think another child. They were in the middle of some kind of large-getting-violent disagreement between a non-humanoid race. The elder got killed. There was no CGI for this race, by the way, (or in the movie at all, I think) there were very intricate, creative, real costumes on these people. The disagreement was over an artifact/custom/way of life that the antagonist was against the elder continuing the worship of. There wasn't a city, per say, but it was in a very natural setting. It might have been in a canyon of some sorts. It might have been from the 60s-70s? I'm sorry; that's not a lot to go on. Any help would be greatly appreciated.