Crystal Bone

The Crystal Bone is a special item, an equippable accessory that is obtained from Stardeer Coffee in Wendy Wu: Homecoming Warrior Kick-in Challenge. It is the sixth special item the New Teenager and Wendy Wu receive from Nina Wu after brewing a unique blend that has not been brewed before. When a Yin Warrior has the Crystal Bone equipped, his or her Yin stat points are doubled.

In-game description
''Double your Yin points! (Double Yin)''

Trivia

 * The Crystal Bone is based on the real-life legendary crystal skulls, well known from the Indiana Jones movie Indiana Jones and the Kingdom of the Crystal Skull.