While cuddling with Tianshi, Xuefeng recalled that he can increase her Spirit Talent and that's what he did. Now that he had an additional supply of Fate Qi, he didn't need to worry about using too much of it, and running out of it later.
Tianshi followed his instructions and after a moment of Ling's effort, her talent increased from a black one to a perfect golden one. He was only worried that her father would learn about his ability, but as long as she was careful, there shouldn't be any problems.
Only recently he learned that Spirit Cultivation is just one part of Cultivating. Spirit Qi was one of the nine elements that can only allow you to use Spirit Artefacts.
A person with two elements, fighting against a Spirit Cultivation Cultivator of the same stage, would definitely have a higher chance of winning.