From the Super Mario Wiki, the Mario encyclopedia
Fear Roulette is a special magic attack used only by the boss Ding-A-Ling in Super Mario RPG: Legend of the Seven Stars. The move takes one person of the party. When used, a red diamond appears over a member and begins aiming at a member of the party randomly. When it stops, the diamond falls on the victim and the person faints immediately. Wearing the Quartz Charm renders the attack harmless. This attack is similar to other instant death attacks such as Shaker, Magnum, etc. This attack is also used by the unused palette swap of Corkpedite, Pile Driver.
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