The Triforce Slash (トライフォースラッシュ, Triforce Rush) serves as the Final Smash of both Link and Toon Link in Super Smash Bros. Brawl and Super Smash Bros. 4, and Toon Link and Young Link in Super Smash Bros. Ultimate. Link, Young Link, or Toon Link repeatedly slashes the enemy using the power of the Triforce, and then delivers a finishing blow with enough power to KO.
The attack starts out with the Triforce symbol on the back of the user's hand glowing (and in SSB4's case, a large projection of the Triforce visibly being shown hovering above the user's hand). A ray of light will stun anyone horizontally in front of him. The user will then dash toward an opponent stunned by the beam and strike them repeatedly for an immense amount of damage. The ambient time stops, making it safe when used in moving stages. The Super Smash Bros Brawl: Premier Edition player's guide says that the attack can only reach two character lengths in front of the user. However, the guide is incorrect: the attack can actually reach all the way across Final Destination for Link and halfway across for Toon Link if one holds on to the special button.
This attack seems to be primarily meant for a single target, but more than one character can easily be hit simultaneously if they are close enough to each other and can even KO multiple characters. Ike's Great Aether is very similar to Triforce Slash, as they both trap the opponents in a barrage of powerful slashes, but one of Triforce Slash's advantages is that it can be done at the edge of the stage, greatly increasing the rate of KO. Apparently, another player can change the knockback angle of the final blow that ejects the opponent. When the user is pausing to charge the final blow, another player can attack the trapped player and when the user unleashes the ejecting blow, the victim will be sent flying according to the knockback of the other player's move.
Toon Link's Triforce Slash does the exact same amount of damage and number of hits as Link's, and only differs in appearance/sound effects. Toon Link's Triforce Slash has a more cartoony appearance than Link's, as a reference to The Legend of Zelda: The Wind Waker's cartoonish graphic style. In addition to Toon Link's version being more The Wind Waker-esque, it is also a bit slower. It also has a much lower range and slightly less knockback, but on the flip side has much less startup time. The final strike at the end of his Triforce Slash has greater range than Link's, though only has around the strength of a smash attack. Note that the character will get super armor from being caught by the Final Smash, but they are also trapped in the spot where they are caught by the Triforce symbol.
In Ultimate, Young Link's Triforce Slash is much closer in appearance and function to Link's in SSB4 than to Toon Link's version.
The main target will receive a total of 78% damage from the full attack while others may receive up to 60% before being ejected by the second-to-last strike. Each strike will cause 4% and trap any victims for the next strike, until the 15th, which ejects all but the primary target from the attack and is followed by Link winding up for the final blow. Additionally, if the attack is used at close range, the attack does 5% damage while trapping the target(s), yielding up to 83% total damage. The last strike causes 18% damage and immense knockback to the main target and anyone close enough to it. This is the same for both Links.
In ‘’Brawl’’ this move has OHKO potential if used properly. In SSB4, its damage potential was lowered dramatically from 83% to 60%, as well with its knockback, and it can no longer OHKO. In Ultimate, Toon Link's version was nerfed again, with its maximum damage being reduced to just 56.2%. However, Young Link's version retains the 60% damage output from SSB4, as well as the full knockback from said game, being one of the few returning Final Smashes to not have a knockback reduction.
Triforce Slash glitch
This move is unique to the Super Smash Bros. series. However, it is similar to the final blow performed against Ganon during the final boss battle in The Legend of Zelda: Ocarina of Time. In this game, once Ganon has been damaged enough, he falls down and Zelda uses her magic to paralyze him, leaving him vulnerable to a final strike, which consists of three slashing attacks before Link pierces through him with his sword.
Years after Triforce Slash's introduction in Brawl, a similar rush of sword strikes became one of Link's abilities in The Legend of Zelda: Breath of the Wild through dodging with perfect timing, known as Flurry Rush. However, the Triforce plays no part in the move.