Not just Ye Mo, but everyone else also didn't expect to see the One Purple Flare, it was the number two ranked heaven flame in the cultivation realm.
The reason it was called this name was because in any cultivation realm, this flame would only appear once. There won't be two One Purple Flare in one cultivation realm. This flame was found in the depths of the earth and was extremely hard to find. Even if one found it, without fate's favour you wouldn't be able to obtain it.
The One Purple Flare, like the number one ranked heaven flame Blue Like Morning Sky, would only appear once in a single cultivation realm. It was even hard to hear about it, much less see it.
It was said that when the number one flame Blue Like Morning Sky appeared, the entire cultivation realm was blue. Once this flame was upgraded to a high level, it was enough to burn an entire realm. That was a bit of an exaggeration, but it showed just how powerful this flame was.