The Whooping Sun Diamond Blade is a large sword with the ability to cut through rock from a great distance. Its previous wielder's name is unknown. It was briefly seen in Kung Fu Panda: Legends of Awesomeness in the Jade Palace's Hall of Warriors.
HistoryHall of Lame", Po was trying to get ideas for what to place in the Hall of Warriors for his own warrior trophy. He stopped by the blade and imagined using it in battle.