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Mariner Castle orbited the planet Mercury and in the manga it was the palace of Princess Mercury, given to her by Queen Serenity when she was born.

In Act 41, each of the Solar System Senshi called upon the power of their castles and directed it to the Holy Grail, which allowed Sailor Moon to transform into Eternal Sailor Moon.

Trivia

  • Named by the the first spacecraft to visit Mercury, which took photos from Mercury.

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