Yasuo's prestige skin on the PBE looks to be taken from scrapped True Damage concept art : r/leagueoflegends
True Damage Yasuo Prestige LoL Splash Art 8K Wallpaper #7.2701
Surrender at 20: Red Post Collection: Prestige in the Second Half of 2020, Universe Updates & more
Surrender at 20: True Damage Yasuo Prestige Edition Now Available!
Prestige True Damage Yasuo Skin Spotlight - League of Legends
Surrender at 20: True Damage 2019 - Akali, Ekko, Qiyana, Senna, & Yasuo
True Damage Yasuo Prestige Edition Wallpapers - Wallpaper Cave
Surrender at 20: Red Post Collection: Prestige in the Second Half of 2020, Universe Updates & more
Surrender at 20: True Damage Yasuo Prestige Edition Now Available!