True to his title, the Graceful Assassin, Marluxia wields a large, elegant looking scythe called the Graceful Dahlia in battle. The handle of the scythe is a pastel green color, and the blade is a rose pink. This evokes an appearance of a plucked flower. The connection between them is yellow and resembles pieces of the Organization logo. Marluxia attacks with wide slashes and spins. He can also turn himself and his scythe into a lethal pinwheel and fly around the battlefield, causing heavy damage to anyone who cannot dodge out of the way.

Marluxia fights using the attribute of Flower and wields a large, rose pink and dark green scythe. The petals he commands have the appearance of cherry blossoms in the Game Boy Advance release of Kingdom Hearts: Chain of Memories but have been changed to resemble rose petals in his console game appearances.

Despite his arrogant nature, Marluxia has proven to be quite powerful. With his command of flowers, Marluxia can create a clone made of petals, send a flurry of blossoms at his opponent, and in Kingdom Hearts Re:Chain of Memories, Marluxia uses a sleight in which he creates a powerful shock wave by hitting the ground with his scythe. Like most Organization members from Kingdom Hearts: Chain of Memories, Marluxia moves by levitating. In the remake, he can also teleport freely. This is also the only form in which he is constrained to the use of an actual deck.

In his first final form, Marluxia makes use of his mechsuit-like Nobody to slash at Sora with its scythe arms, or charge him and cause massive damage upon impact. He can also summon three petals to fire pink rays and fire blasts of energy from the bottom of the contraption. In the remake, the Nobody is also capable of harnessing darkness with which it can shroud the whole field.

Marluxia's additional final form in the PlayStation 2 remake brings Marluxia and Sora into combat upon a larger version of Marluxia's phantom mech floating in a starry-night environment surrounded by circulating rings. A large angelic Nobody stands behind him wielding a gigantic version of Marluxia's Graceful Dahlia. Marluxia is held immobile during this fight by Nobody thorns and is, therefore, unable to dodge most attacks.

From his stationary position, Marluxia fights mainly by commanding the Nobody, who can create shock waves, shoot a sweeping laser, blow gusts of wind that prevent Sora from moving forward, and create a whirlwind that scatters all of Sora's cards, including his reload bar. Sora must then pick up the cards in order to reclaim them, including the reload bar. Marluxia's most notable sleight, however, is that in which he shoots Nobody thorns that triggers a countdown timer similar to the recurring Final Fantasy spell "Doom", in which, if the counter reaches zero, the fight is instantly lost. He can also trigger the one rotating ring around the battlefield, causing it to fire lasers from all directions in addition to reusing the ray-shooting rose petals.

In Kingdom Hearts II Final Mix, Marluxia returns in an optional battle with new tactics. He begins the battle by whispering in Sora's ear, which causes a countdown timer to appear above Sora's head based on his current level, similar to the hit point condition of the Titan Cup, and then spends most of the battle attacking Sora relentlessly with his scythe, with each hit depleting the timer by one, though causing no additional damage.

If the timer reaches zero, Sora loses the battle, but the timer can be increased by using the Reaction Command "Rob Count", in which Sora grabs Marluxia's scythe, knocks him into the air, and hurls the scythe at him, adding thirteen points to the counter. Marluxia also can conjure black circles which cover most of the floor and deal damage to Sora's HP, but leave the death timer unaffected. Marluxia also wheels around the floor swinging his scythe, can surround Sora with thorns that explode after a short time, and can hover above Sora attacking him with his scythe while making pillars sprout up from the ground and deal damage to Sora.

The manga version of these battles differs from the version of the Chain of Memories games. In it, Marluxia does not use alternate forms and is easily killed by Sora in the first battle. He is also surrounded by flowers or flower petals a good deal of the time, and is sometimes seen holding a rose.

In Kingdom Hearts 358/2 Days, Marluxia has a Limit Break called Bloom-Out. During Bloom-Out, Marluxia begins to charge an attack while a large black ring forms around him. Once the attack finishes charging and the black ring is completely formed, Marluxia swings his scythe multiple times over a large area on the black ring. During the initial portion of the Limit Break, with a perfectly timed button press, Marluxia will be surrounded in cherry blossoms and may instantly kill any weaker enemy hit by the attack.

During Marluxia's Final Limit, Marluxia teleports before the attack, and his swing is much faster and covers a much larger area, followed by the release of a large, crescent-shaped projectile.

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