The Mercury Sword is a live-action blade carried by Sailor Mercury in Pretty Guardian Sailor Moon. She forms it by reshaping her Sailor Star Tambourine, drawing on the might of her home planet when she needs a weapon in a moment of crisis.
Seen only in the live-action Pretty Guardian Sailor Moon, this sword is a form that Sailor Mercury coaxes out of her Sailor Star Tambourine. It exists for combat, letting her strike at threats and stand in defense of the Earth.
To bring the blade into being, Ami summons the power of the planet Mercury and reshapes her tambourine, a step she takes in desperation while trying to hold back the Youma raised by Princess Sailor Moon. The move plays as a final gamble rather than a standard tactic.
Sailor Mercury is the only one to wield the sword. After the Youma were pushed back, she and her fellow guardians closed in around Usagi but could not halt the destruction of the planet and were beaten down. The weapon returns in the Special Act, where Mercury, Mars, Jupiter, and Venus each call their arms once more to bring down Queen Mio. It first appears in the Final Act.

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In the live action Pretty Guardian Sailor Moon, Sailor Mercury's weapon is the Mercury Sword, a blade she forms by reshaping her Sailor Star Tambourine.
Sailor Mercury summons the power of the planet Mercury and reshapes her Sailor Star Tambourine into the Mercury Sword, a desperate move rather than a routine tactic.
Sailor Mercury first uses the Mercury Sword in the Final Act, The 5 Sailor Guardians Who Surpassed Their Previous Lives, while trying to hold back Youma raised by Princess Sailor Moon.
The Mercury Sword is used for attacking threats and defending the Earth in the live action Pretty Guardian Sailor Moon series.
Yes, the Mercury Sword returns in the Special Act, where Sailor Mercury joins Mars, Jupiter, and Venus in calling their weapons once more to bring down Queen Mio.
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