Shadow Crystal

The Shadow Crystal is a crystal owned by the House of Shinozawa, it is a ball sized crystal said to cause bad luck to the owner, it is the last remaining-relic of the extinct Shinozawa family

Appearance
It is a black crystal with white kanji on it.

In Supernanny: The Theory Animated
The Shadow Crystal appeared when Huizong, Samuel, Toshio, Ri Dae-Jung, Hiro, and Meimei to guard it to stop Gadadhara's teachers from stealing it, Huizong was then later asked alongside Hiro and Meimei to stop a horde of teachers and help the Chinese Ghost Children