The Cosmos Crystal, also called the Cosmos Seed, is the Sailor Crystal of the Galaxy Cauldron. Guarded by Guardian Cosmos, it holds the regenerative Lambda Power capable of rebirthing an entire galaxy of star seeds, and in time it becomes the crystal of Sailor Cosmos.
Referred to as well as the Cosmos Seed, this gem is the Sailor Crystal tied to the Galaxy Cauldron, the birthplace of all such crystals. It carries meaning at the close of the manga, its Crystal adaptation, and chosen stage plays. Though hidden away in the manga, it briefly appears in Sailor Moon Cosmos as an octahedral silver shape ringed by a circular rainbow aura, resembling other star seeds.
Watched over by Guardian Cosmos, the crystal holds a supreme restorative force called Lambda Power, a name that nods to the cosmological constant of physics. When Eternal Sailor Moon awakens that power through her Silver Moon Crystal Eternal Power, it proves strong enough to recreate and reawaken a galaxy's worth of Sailor Crystals. In the stage version Le Mouvement Final, Sailor Cosmos channels it in the attack Cosmos Crystal Lambda Power against Chaos during a glimpse of her future, and Eternal Sailor Moon later activates its healing much as she does in the manga.
Guardian Cosmos protects the crystal, while Eternal Sailor Moon draws out its Lambda Power by gathering the strength of every Sailor Crystal within herself, an act that leads Sailor Cosmos to name her the true Sailor Cosmos. In a future age the gem goes on to become the very Sailor Crystal of Sailor Cosmos.

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The Cosmos Crystal, also called the Cosmos Seed, is the Sailor Crystal tied to the Galaxy Cauldron, the birthplace of all Sailor Crystals.
The Cosmos Crystal holds a supreme restorative force called Lambda Power, capable of recreating and reawakening an entire galaxy's worth of Sailor Crystals when Eternal Sailor Moon unleashes it.
Guardian Cosmos watches over the Cosmos Crystal throughout its existence.
Eternal Sailor Moon draws out the Cosmos Crystal's Lambda Power by gathering the strength of every Sailor Crystal within herself, an act that leads Sailor Cosmos to name her the true Sailor Cosmos.
In a future age, the Cosmos Crystal goes on to become the very Sailor Crystal of Sailor Cosmos.
Looking for more on Cosmos Crystal? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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