Elder Sun (Cleansing Incense Ancient Sect) cultivated the Violet Cloud Merit Law at some point. He abandoned it after reaching the Heaven's Primal level and swapped to a compatible Virtuous Paragon Merit Law.
Protector Mo and Nan Huairen came to Li Qiye and asked him to examine their cultivation. After learning that both of them used the Violet Cloud Merit Law, Li Qiye gave them pointers how to use it more efficiently and also promised that within a year they would be able to practice a complete Violet Yang Ten Suns Merit Law.
Around the same time, Elder Sun (Cleansing Incense Ancient Sect)'s cultivation had a problem. Protector Mo, as his disciple, naturally had to help his master, so the first thing that came up in his mind was Li Qiye. Of course, Elder Sun thought that his disciple's idea was too outrageous, but Protector Mo brought up the pointers from Li Qiye regarding the Violet Cloud Merit Law to Elder Sun. Elder Sun tried it once and he saw its effectiveness, surprising him.
The speed and efficiency of cultivation can be boosted uo to five or six times by absorbing the sunlight in the morning and extracting the essence in the clouds in the late afternoon. Extreme Yang Vital Flame from the sun and the afternoon vital essence combined together with the world natural energy is a shortcut to refine Longevity Blood.