Precioustone

The Precioustone (プレシャストーン) is a mysterious stone from the dream world known as Maginaryworld. It appeared in the Dreamcast game Sonic Shuffle.

Description
The Precioustone keeps Maginaryworld under control while residing in the Temple of Light. The Precioustone is shattered by Void, which causes Maginaryworld to fall into disaster. The many dream worlds that were created were starting to change, as they are encased in the dark magic that the Precioustone could not stop anymore. After being brought to the world by Lumina Flowlight, Sonic and friends then set out on a quest to find all the pieces of the Precioustone and repair it. Eggman also follows them as he was accidentally sucked in by the vortex as well, he however instead of playing the role as the villain, is slightly helpful at times or causes minor havoc for the players as a way for punishing them for not doing well on the board. Eventually, the heroes repair the stone and leave Maginaryworld.

Trivia

 * Like the Time Stones, the Prescioustone is one of the few mystical items that so far do not give Sonic nor his friends a Super transformation. Instead, the Precioustone was used by the villain Void to undergo a super transformation into a monster.
 * In the Archie Comics version, it was given the name the Master Precioustone, and the pieces it broken into simply called Precioustones, as given in The Complete Sonic Comic Encyclopedia.