Cosmos Crystal

The Cosmos Crystal (コスモス・クリスタル), or Cosmos Seed (コスモス・シード), was the crystal of the Galaxy Cauldron. Protected by Guardian Cosmos, it released the ultimate universal Lambda Power when awakened, and that power was strong enough to recreate and rebirth an entire galaxy worth of Sailor Crystals. It was never shown in the manga or Sailor Moon Crystal, but its effects were easy to see.

In Act 60 and Sailor Moon Cosmos, the Cosmos Crystal was activated through Sailor Moon, and all of the Sailor Crystals trapped in the Cauldron were reborn and their power attacked Chaos until it was almost completely destroyed. Afterward, the Lambda Power sent all of the Crystals back to their planets, where they resumed the forms they had before they were destroyed by Sailor Galaxia, as explained by Sailor Cosmos.

Trivia

• While this crystal had two names in the Japanese version of Sailor Moon Cosmos, it was consistently called "Kosmoskristall" (Cosmos Crystal) in the German dub.