| Flare Blade
Roy's fully charged Flare Blade being unleashed upon Donkey Kong and Bowser.
||When it's fully-charged, Roy's destructive Flare Blade delivers an instant KO.
|—Roy's trophy description
Flare Blade is Roy's neutral special move, derived from his clone Marth's Shield Breaker. This attack can be charged for up to five seconds by holding the special button, growing stronger the longer Roy holds it in position. When fully charged, the attack inflicts 50% damage to all opponents hit and delivers a one-hit KO to even the heaviest characters in the game on any normal-sized stage (on large and/or irregular stages such as Temple, the move may not instantly KO.) The blade may become powerful enough to break shields in a single swipe. Roy takes 10% recoil damage from the explosion of the fully charged attack, regardless of whether it hits a target or not. If Roy releases the attack one frame before it is fully charged, it will deal 41% instead of 50% damage, but will give even more knockback than the fully charged attack.
In Fire Emblem: The Binding Blade, the titular Binding Blade wielded by Roy is capable of channeling fire when Roy attacks from afar or scores a critical hit. Roy's movements and sword arc when using Flare Blade are also based on his critical while wielding the Binding Blade.