Killing Edge

When it glows, its power intensifies. The Killing Edge (, Kill Sword) is an item from the series in Super Smash Bros. Ultimate. It was revealed in the Nintendo Direct on August 8, 2018.

Origin
The Killing Edge is a sword that recurrently appears in the Fire Emblem series. It is notable as one of several "killer" weapons, a class of weapon that substantially boosts the likelihood of its wielder landing a Critical Hit. In the Fire Emblem series, a critical hit causes a weapon to deal three times its base damage, a trait that is reflected in Smash Bros. in the form of increasing damage and knockback when the sword is glowing. The Killing Edge's design in Ultimate appears to take inspiration from its appearances in Fire Emblem: Blazing Blade and Fire Emblem Awakening, with the weapon's shape and design resembling its appearance in the former, and the color scheme of the sword hilt resembling its color in the latter. Additionally, weapons will glow pink during critical hit animations from Fire Emblem Awakening onward.

Overview
The Killing Edge is a battering item. Normally is deals 5% (blade)/6% (tip) with a neutral attack, 10%/11% with a tilt attack, and 15%/16% with a smash attack. Every 242 frames (4.0 3 seconds), its blade glows pink for 90 frames (1.5 seconds) and, if the user swings it during this time, the damage and knockback dealt by the attack will be doubled. The critical hit sound effect from the Fire Emblem Game Boy Advance titles will play.

Spirit
Equipping the Ravio, Aegislash, Navarre, Lon'qu, or Shadow Man support spirits will give the player a Killing Edge at a start of their stock.

Trivia

 * Killing Edge is the first weapon from Fire Emblem to appear solely as an item and not as a playable character's weapon.
 * If charges a smash attack with the Killing Edge, a different sound effect plays instead of his usual one. This also happens when charging a Death's Scythe.