Legendary Silver Crystal

The Legendary Silver Crystal (often called The Imperium Silver Crystal or The Silver Moon Crystal) is a small crystalline object with immeasurable power.

Abilities/Powers
The Silver Crystal possesses extraordinary power, and is possibly the single most powerful artifact in the universe. Focusing the energy of the user, it can perform spectacular feats, such as reviving an entire world from ruin, but the strain of using such a power often causes the user to lose their life, as the power actually derives from the life force of the user, a member of the Moon dynasty, the members of which alone can actually use it. It is shown as the source of Queen Serenity's power during the Silver Millennium; Usagi Tsukino goes on to inherit the Crystal.

Originally, the Silver Crystal belonged to Queen Serenity of the Moon Kingdom; whilst using the crystal to protect the Moon and the Earth, it also allowed the people of the moon to enjoy long lives. When the Moon Kingdom was destroyed by Queen Beryl under the influence of Queen Metalia and the Queen's daughter,Princess Serenity was killed along with her guardians and Prince Endymion, Queen Serenity used the Silver Crystal to seal away the enemy, as well as to send her daughter, the prince and all of the Sailor Senshi to be reborn in the future on Earth, so they could hopefully live happy, peaceful lives. Having used too much of the crystal's power, the Queen then died.

However, several artefacts rival it in strength, including the Black Crystal of the Death Phantom and the Starlight Crystal of Hikari Kagayaki.

Trivia

 * Even though Chibiusa is part of the Moon dynasty, she doesn't draw power from the Silver Crystal (unlike her mother and grandmother).Instead, she receives her very own Pink Moon Crystal. Some fans have speculated that this is because Chibiusa holds the blood of the Moon and Earth, while others believe that it's normal for Moon Queens to have their own Sailor Crystal and that Princess Serenity was born out of an empty shell at the Galaxy Cauldron, which can explain the absence of Queen Serenity's husband and the fact they both share the same star seed.