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The Key of Space-Time (also known as the Space-Time Key, or more simply the Time Key) was an item carried by Chibiusa. The Key allowed her to call upon the Time Guardian so that she could travel to the Space-Time Door, and could also bring people with her if she wished. The use of the Key alone was a taboo, and bringing people with her was even more so. However, as Chibiusa only ever brought Sailor Senshi or Tuxedo Mask with her, she was never shown suffering any consequences.

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The Time Key as seen in the anime