The Chaos Crystal, also called the Chaos Seed, is the Sailor Crystal born of the Galaxy Cauldron. Guarded alongside Chaos itself, it figures into the finales of the manga, Sailor Moon Crystal, and certain stage musicals.
Known also as the Chaos Seed, this gem is the Sailor Crystal belonging to the Galaxy Cauldron, the wellspring of all star seeds. It carries weight in the closing chapters of the manga, in its Sailor Moon Crystal adaptation, and in select entries of the stage productions.
The crystal was watched over by the Guardian Chaos, a protector bound to it much as Chaos itself was bound to the Galaxy Cauldron. When Eternal Sailor Moon unleashed her Silver Moon Crystal Eternal Power, both Chaos and its guardian were dissolved and defeated almost completely, sacrificing themselves back into the Cauldron. That destruction proves impermanent, however, since the crystal is fated to reform in a distant age.

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The Chaos Crystal, also called the Chaos Seed, is the Sailor Crystal born of the Galaxy Cauldron, the wellspring of all star seeds.
The Guardian Chaos watches over the Chaos Crystal, bound to it much as Chaos itself is bound to the Galaxy Cauldron.
When Eternal Sailor Moon unleashes her Silver Moon Crystal Eternal Power, both Chaos and its guardian are dissolved and nearly destroyed, sacrificing themselves back into the Galaxy Cauldron along with the Chaos Crystal.
Yes, the Chaos Crystal is fated to reform in a distant age, when Chaos rises again as the Sailor Guardian known as Sailor Chaos.
The Chaos Crystal is mentioned in the manga's Act 60 Stars 11 and in Sailor Moon Cosmos, and it also factors into the stage musical Pretty Guardian Sailor Moon: Le Mouvement Final.
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