which chapter was it when Xiao Yan fights with the disciple who killed Yao Lao and conquered the region(?).....
I'm not really sure if this is the confrontation that you are talking about or not, but he fights with Han Feng for the second time around at around chapter 632ish. He fights with Han Feng before (i don't remember what chapter that is though), but I don't think he "conquered" the region that time around, hence that's why i went with this confrontation. Edit: I don't really remember if you can consider him conquering the region either time, since it's been a while since I read it, so that's why i am not sure if this is what you are wanting.