It's normal for cultivation techniques to have flaws.
In fact, any practice that doesn't allow you to achieve immortality in one step can be considered incomplete. Even so, compared to other flawed techniques, the Taiyin Kill Skill is extremely impressive.
Besides, the creator of this technique is the Imperial Teacher, a woman of phenomenal talent and divine beauty, who comes from the mysterious Yunzhong Pavilion of the Wuzhou. Fox Er, as breathtakingly beautiful as the country, has never let Lu Bei down. The Qingqiu Immortal Method can slay or tame dragons, each one being the divine skill. The Taiyin Kill Skill that the Imperial Teacher herself cultivated wouldn't be bad.
The only thing that Lu Bei found problematic was this so-called Taiyin Power.
