Kirby dons a green cap and wields a giant sword. He then swings the sword, trapping nearby opponents, and slashes the character multiple times. After slicing the opponent multiple times, the sword grows bigger, and Kirby finishes with a powerful blow, which sends the targets flying at a fair distance. The Final Smash deals a total of 40% damage.
Ultra Sword is a Super Ability from Kirby's Return to Dream Land. Super Abilities are obtained by copying "Super" versions of enemies and expire upon finishing the level or running out the ability's time limit. Ultra Sword specifically involves Kirby swinging a huge sword in front of him to deal enormous damage to any enemies within range, though it can also randomly appear as a meat cleaver, a wooden training sword, a fan, Meta Knight's Galaxia, or a large blue fish. Like all Super Abilities, it destroys terrain marked with star emblems and allows access to alternate dimensions where Sphere Doomers are found. Ultra Sword also appears in two boss battles, where it must be used to break the boss's shield and subsequently land the final hit; in these instances, the sword also grows larger just before the final strike. However, the actual attack is executed differently, with Kirby striking with three different swords along with the standard Ultra Sword, for a total of five hits.