Xueling Sect, one of the four large Sects, was considered as the largest Sect where Xiedao was practiced by the disciples, and there were rumours that long time ago, in Zhen Wu Jie, 'Modao' didn't exist and humans practiced only 'Xiedao'. (NT: Modao= Devil way; Xiedao= Evil way)
According to legend, long time ago, the Devil world had invaded Zhen Wu Jie, and had caused havoc in this world. It was a great disaster, and although the devil world's attack was repulsed, but throughout the long duration of this major cataclysm, the Devil world had succeeded in sowing the seeds of 'Modao' in Zhen Wu Jie, giving birth to the existence of devil warriors.
When the Devil world had invaded Zhen Wu Jie, many human warriors had fallen prey to the magic of devil race and had been confused which degenerated their morality, causing them to become depraved warriors and also started practicing the 'Modao' and devil race's power techniques, which were also practiced by the Modaoists nowadays.