Silver Crystal

The Silver Crystal is an artifact of great power, wielded by royalty of the Moon Kingdom. It was used by Queen Serenity to defeat a great evil and ensure that the people of the past would be reborn in the future, and has not been seen since. It is in high demand by multiple factions seeking to conquer Earth.

Powers
The Silver Crystal channels the holy power of the moon. It is capable of purifying targets of evil influence and dispelling dark energy, and can channel lunar energy attacks. In times of extreme need, the user can use it as a powerful and highly destructive superweapon, unleashing devastating power. Doing so, however, will often cost the wielder her own life.

In rare cases, it has the ability to bring back the dead, but such a power is never to be abused or taken for granted.

Current Status
The Silver Crystal has been missing since antiquity, having vanished when Queen Serenity died, but rumors of Princess Serenity's rebirth suggest that the seven Rainbow Crystals may hold the key to finding it.