The name of this article wasn't revealed in the novel and instead was given by editors of the wiki as substitute for lack thereof.
Dark Crow later passed the Solar Immortal Physique Merit Law to Su Ru, in the hope that her and Min Ren's son and descendants could cultivate it. It became the ultimate technique of the Heaven's Edge's Su Clan, that only the direct descendants could cultivate.
Min Ren's descendant, Su Yonghuang cultivated the Solar Immortal Physique Merit Law, because she believed to be born with the Mutual Sky Physique from the Solar Immortal Physique's branch. She abandoned it when Li Qiye revealed her true Physique.