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Flare Blade

From SmashWiki, the Super Smash Bros. wiki

Roy's fully charged flare blade being unleashed upon Donkey Kong and Bowser

Flare Blade is Roy's neutral B move. Marth has a similar move called Shield Breaker. Flare Blade can be charged for up to five seconds by holding the B button, and when fully charged, it does 50% damage and delivers a one-hit KO. However, on some of the larger stages, like The Temple, it doesn't deliver a OHKO. Roy takes 10% damage from the explosion of the fully charged attack. Flare Blade has the potential to break shields when it is charged up to a point.

[edit] Origin

This move is based on Roy's Melee critical hit in Fire Emblem: Fūin no Tsurugi, when he has the Sword of the Seals.

Roy's Special Moves
Standard Special Move: Flare Blade
Side Special Move: Double-Edge Dance
Up Special Move: Blazer
Down Special Move: Counter