Master Xehanort appears as a boss in Kingdom Hearts Birth by Sleep. In Terra's story, he is fought twice in a row. The first fight is against both Master Xehanort and Vanitas, but the fight is ended prematurely, and the second fight is the penultimate fight of Terra's story: a one-on-one duel between Terra and Master Xehanort.
Master Xehanort serves as the final boss of Kingdom Hearts III, where he is fought by Sora and the party in Scala ad Caelum. He is fought twice in a row. The first fight is against him in his armored form and the second fight is against him while he wields the legendary χ-blade. A data replica of him is also a optional boss in Kingdom Hearts III Re Mind.
Kingdom Hearts Birth by Sleep
Terra will fight both Master Xehanort and Vanitas two-on-one. Vanitas should be the primary target as Xehanort will mostly dodge and keep a distance from Terra. Xehanort isn't very difficult and after sustaining minor damage, the battle will end.
The second battle is the true battle against Master Xehanort. Like the previous battle, Xehanort will keep a distance, but now has access to wide-ranged magic spells. All of his attacks, including magic-based ones, can be dodged with the right timing. Cure commands and Shotlocks ease this battle significantly.
Kingdom Hearts III
Sora should have several Elixirs equipped, with Curaga set as a shortcut. Stocking a Kupo Coin is also helpful. The Ultima Weapon will be the most efficient Keyblade to have equipped, but Hero's Origin, Shooting Star, Crystal Snow, Hunny Spout, and Wheel of Fate are also useful for their Formchanges.
After the Replica Xehanorts are defeated, Master Xehanort absorbs them and dons his new Keyblade Armor, then reshapes the plaza into a closed chamber to initiate the beginning phase. Keeping track of Xehanort's position can be difficult due to his speed and the size of the arena. Airstepping can be used to stay close to Xehanort, but can sometimes result in accidentally leaping to one of the flagpoles dotting the arena. Speedy or homing attacks such as Flare Force, Double Arrowguns, Hunny Blasters, Highwind, and Blizzard Blades will be useful for dealing damage, while the defensive Counter Shield can be used for its Wrathful Fist reprisal.
After getting his health down to a certain point,[?] Xehanort will move the battle underwater, initiating the middle phase. As formchanges cannot be used underwater, Sora will not have access to Rage Form.
Finally, after reducing his health even lower,[?] Xehanort will move the battle to the stormy skies above the city, initiating the closing phase. Sora will be alone during this phase, meaning that Donald Duck and Goofy cannot heal or support him. Sora should focus on dodging Xehanort's attacks and healing when necessary.
Armed with the legendary χ-blade, Xehanort has an arsenal of powerful attacks at his disposal. Sora should focus on defense, as "Tataki Otoshi" will prevent him from landing attacks easily. Sora should also be close to Xehanort as much as possibly to prepare for "Call Calamity". While Xehanort uses it occasionally, it is his most dangerous attack and even getting hit by blizzaza can cause devastating damage to Sora. It comes out fast and if Sora is too far when Xehanort throws the χ-blade, it will halt in front of him and activate the -za spell sequence immediately meaning Sora has no choice but to withstand it. The only way to avoid this is to stay very close to Xehanort to properly block the χ-blade throw. Successfully blocking the attack allows for Sora to follow up with a reprisal. Reprisals such Counter Blast and Wrathful Flurry are useful for injecting damage, as well as speedy Formchanges like Highwind, Blizzard Blades, Twin Yo-Yos, and Nano Arms, or homing techniques like Flare Force.
After losing seven and a half health bars, Xehanort will initiate the second phase of the battle by summoning Kingdom Hearts via "Ascension", then immediately launch into "Dark Shooting". He will continue employing his earlier techniques, albeit enhanced via "Ascension".
After four more of his health bars are depleted, Xehanort will use the power of Kingdom Hearts to steal Sora's light, forcing him into a version of Rage Form that cannot terminate or use Riskcharge. In order to return to normal, Sora must attack Xehanort to force him to drop orbs of light[?] which both fill the Situation Gauge and restore HP. During this portion, Xehanort cannot be directly damaged, but will continue to use his enhanced attacks. After filling the Situation Gauge, Sora can use "Return to the Light" to attack Xehanort and revert back to normal. Xehanort will respond with "XIII Combo", then continue attacking as normal. If enough time passes[?] without advancing to the final phase, Xehanort will steal Sora's light again, forcing Sora to retrieve it once more.
Once Xehanort is down to 1 HP, Sora can use "Last Ray". However, Xehanort quickly counters and retaliates with a beam of darkness that seemingly kills Sora. Sora can then use "Trinity", ending the fight.
Kingdom Hearts III Re Mind
A replica of Master Xehanort in his armor serves as the final boss of the Re Mind scenario. The player can choose to play as either Sora or Kairi.
If playing as Sora, he should be equipped with some elixrs, Ultima Weapon and/or Oathkeeper/Oblivion.
This version of Armored Xehanort fights exactly like the first Armored Xehanort fight with some extra moves. His Keyblade attacks are augmented by the twelve No Names surrounding him, dealing extra damage. Xehanort can summon flame pillars from either above or below to hurt Sora or Kairi. If Xehanort is summoning a pillar from below, a recusant's sigil will spawn before summoning a pillar. If he is summoning a pillar from above, some yellow particles will surround the player and lift them up briefly before the attack. Both of these serve as indicators to dodge or block if Sora is using a form with Barrier or if playing as Kairi. Halfway through the battle, Xehanort's armor will break and he will begin his desperation attack. He will summon several planetoids and break them apart with his Keyblades, causing meteors to rain down on Sora and Kairi. The meteors are unblockable so the player should just dodge roll or slide away.
Occasionally, Xehanort will attempt to attack the player during the meteor rain. Simply block the attacks while trying to avoid the meteors. If playing as Sora, a Link can be used to remain unkillable during the attack. If playing as Kairi, it's best to notice the patter of meteors falling and either constantly slide to places where the meteors haven't fallen yet or slide exactly where a meteor just landed. During the second phase Xehanort will often place mines in the air which will leave an explosion trail leading to the player. After reducing Xehanort's HP to 1, a situation command will appear called Connecting Hearts which acts just like the Last Ray command and is required to end the fight.
Master Xehanort's data is a recreation of his final boss battle. He retains most of his attacks from the final battle, but this time he can Formchange the χ-blade into a myriad of weapons, such as a double blade that reduces Sora's maximum HP, a pair of chakrams that stun Sora on impact, a whip that has very long range, spinning bombs that can freeze Sora, spikes that shoot lasers from the sky, and massive aerial cannons that fire large beams. He often combines the Formchanges with his old attacks.
Many of his slashes now unleash spinning bombs that can be guarded at first but will explode, freezing Sora and as such must be dodged or blocked and dodged. Xehanort also uses great use of spikes that fire multiple beams of light that will fire exactly where Sora is at and as such, must be dodged right before they hit. Xehanort will also make use of giant cannons he manifests in the air that also track Sora before firing. Dodge the moment the cannons finish charging.
The first opening for when he can be attacked is when he throws the χ-blade at Sora. Close the distance and block the χ-blade so it doesn't chill Sora and Xehanort will be staggered and open for a combo. Another opening for when he can be comboed is whenever he throws a spinning bomb at Sora at a farther distance after a long string of throwing them. While using ascension, Xehanort fires the spinning bombs closer to Sora and while outside ascension, Xehanort fires spinning bombs further. Close the distance by airstepping towards him or strike him with magic. The next opening is when he performs a simple slash with the χ-blade, followed by an uppercut, counter and attack him right after the uppercut. The third opening is when he attempts to strike Sora with the spike lasers and close in for an uppercut simultaneously. Either block the uppercut and immediately use a counter for an invincibility frame and a chance to combo him or dodge roll through Xehanort and the lasers and then combo him. Another opening is when Xehanort manifests four cannons consecutively to fire at Sora, which he will use after using Call Calamity, whether Sora is able to interrupt the move or not. Xehanort will teleport to the center of the area after the second cannon fires. Dodge the next two cannon blasts and immediately combo him.
In his second phase, an opening to combo him is when he manifests two cannons instead of spikes while closing the distance with Sora. Dodge the cannon fire and the spinning bomb he throws simultaneously and the following double blade slash and combo him. Another opening is when he combos with a Formchange whip. Block or dodge the whip and the following chakram slash, dodge the double blade slash, dodge another double blade slash, dodge or block two chakram slashes, dodge one last double blade slash, then immediately combo him.
Notes and references