Soul Skills were just like Dou Techniques. If an expert who practiced Dou Qi did not have a Dou Technique, he would only be able to rely on the power of his Dou Qi to fight another. However, he would definitely be at a disadvantage if he fought with someone who possessed a Dou Technique.
During ancient times, Soul Skills were similar to Dou Techniques and had been separated into Tian, Di, Xuan, and Huang class. Currently, Soul Skills were extremely rare.