The Dark Sword is a blade formed from an icicle and wielded by Dark Mercury in the live-action Pretty Guardian Sailor Moon. It proved a strong offensive weapon during her time under Kunzite's control.
The Dark Sword belongs to Dark Mercury in Pretty Guardian Sailor Moon, taking shape out of an icicle. It registered as a powerful and aggressive weapon, and on its debut it loosed an energy-based strike, an ability that never resurfaced in later scenes.
Beyond its one-time energy blast, the sword functioned as a potent melee weapon. It cut down the Moonlight Stick and was turned on Usagi, striking her hard enough to leave her unconscious. That very blow proved decisive, as the harm it caused broke the curse Kunzite held over Dark Mercury.
Dark Mercury alone carries the blade. Once the curse lifted and she caught sight of the sword in her own grip, she flung it away, and it went unseen from then on. It counts as Sailor Mercury's third sword after the Mercury Sword and the Water Sword, all three unique to the live-action series, though only this one is hers as Dark Mercury.

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The Dark Sword is a blade formed from an icicle that Dark Mercury wields in the live-action Pretty Guardian Sailor Moon series. It served as a powerful offensive weapon during the time Kunzite held her under his control.
Only Dark Mercury wields the Dark Sword. Once Kunzite's curse over her broke, she threw the sword away and it was never seen again.
The Dark Sword functions mainly as a melee weapon, powerful enough to cut down the Moonlight Stick. On its debut it also unleashed a one-time energy-based strike that never appeared again.
Dark Mercury struck Usagi with the Dark Sword hard enough to knock her unconscious, and that very blow caused enough harm to break the curse Kunzite held over Dark Mercury.
No, the Dark Sword is Sailor Mercury's third sword in the live-action series, following the Mercury Sword and the Water Sword, though only the Dark Sword belongs to her as Dark Mercury.
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