Robin summons Chrom through a warp circle. Chrom will travel a set distance from where he is summoned (a little less than half the length of Final Destination), and swipe at the first opponent in his path. If he misses, the Final Smash will fail. When he does catch at least one opponent, Chrom's critical hit portrait from Fire Emblem Awakening appears as he yells "On my mark!" (俺に合わせろ！, Join with me!). Once an opponent is caught, the two unleash their attacks: Chrom with the Falchion, and Robin circling the unfortunate foe while unleashing Bolganone and Thunder, assailing the opponent multiple times. Finally, just as Robin shouts out the name of their spell followed by Chrom yelling "We're not done yet!" (くらえ~!, Take that~!) the two strike the opponent(s) at the same time, rocketing the foe(s) to the ground and rebounding towards the upper blast line.
This attack ends up dealing 45% damage - 5% with the initial strike, 26% for the flurry of attacks (13 strikes at 2% damage each), and 14% for the finishing strike. The knockback from the final blow cannot be teched. It can KO an opponent with at least 45% damage under average circumstances. The move elevates Robin and Chrom to the highest point on the stage and always takes place in the center of the stage, except for stages that can cause an OHKO due to the map having a central pit (examples include Gaur Plain and Midgar after Odin's attack). On stages with a high upper platform such as 75m and Boxing Ring, it is essentially a guaranteed OHKO because the opponent is brought up to the top platform, very close to the stage boundary.
Successfully using the Final Smash will restore Robin's Levin Sword and all his tomes to full durability. Overall, the attack is very akin to Ike's Great Aether, only Robin stays in midair when the move ends, risking much less of a self-destruct in comparison.
Like the Pair Up feature in Fire Emblem Awakening that lets two characters attack a foe at once, Robin's Final Smash calls Chrom, the Prince of Ylisse, to the battlefield. First, Chrom dashes forward, and if he lands a hit, Robin joins him for a flawless combination of attacks. It can even catch multiple opponents at once!
Pair Up is a mechanic that was introduced in Fire Emblem Awakening, presented in that game as having been invented by Robin themself based on an an impromptu rescue of Chrom by Sumia. When Paired Up, two units act as a single force upon the battlefield, conveying significant advantages: the lead unit of the Pair Up pair receives boosts to their combat stats from the supporting unit, based on the supporting unit's own stats and class; and the support unit has a chance to actively assist the lead unit combat by following up their attacks with a strike of their own (a Dual Strike) or blocking an incoming enemy attack entirely (a Dual Guard). The Final Smash depicts a series of Dual Strikes.
In more recent Fire Emblem games, units announce incoming critical hits and special skills with a brief, loud start-up in which their face briefly cuts in across the screen, accompanied by a dramatic one-liner. The Final Smash imitates this for Chrom, reusing his portrait from Awakening.
Chrom's dialog in the Final Smash is derived from his in-combat dialogue in Awakening:
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