From the Super Mario Wiki
Silver Bullet is a move used by Jinx in Super Mario RPG: Legend of the Seven Stars. It instantly defeats the target. To guard against this attack, it is recommended to use an accessory such as the Safety Ring or the Quartz Charm. Without these, a perfectly Timed Hit is required to avoid damage completely. An imperfect Timed Hit will reduce the HP of the target to 1.
An unused stronger version of Reacher named Juju can also use this move.
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