Cosmetic cultivation Pill is designed to maintain one's physical appearance and is mostly used by women to stay beautiful as ever. This pill was gifted to Elder Sister Xu Qing by Meng Hao as a proof of gratitude while at the Reliance Sect.
Backstory
It plays a major part in the story because on several occasions Meng Hao has gifted it to Xu Qing. At first it was to keep him safe in the Reliance Sect but over time it was a to way show his affection for her.