Legacy of the Force: Invincible

Invincible is the ninth and final novel in the Legacy of the Force series. It is a hardcover by Troy Denning and was released May 13, 2008. Its title was first announced at Celebration IV. The paperback version was released on December 30, 2008. The audio version is narrated by Marc Thompson. This book determined the final fate of Darth Caedus. At the end of the book, it has an introduction to the novel Millennium Falcon.

Editions

 * ISBN 0345477464; May 13, 2008, Del Rey, 299-page hardcover
 * ISBN 0345477472; December 30, 2008, Del Rey, 347-page paperback
 * ISBN 0739324020; May 13, 2008, Random House Audio, Abridged CD

Back cover
"I name you the Sword of the Jedi. Always you shall be in the front rank, a burning brand to your enemies, a brilliant fire to your friends...."

'''Once mysterious prophecy, Luke Skywalker's words have become truth. But can even the Sword of the Jedi bring down one of the most powerful Sith Lords of all time?'''

Internal flap
''No war can last forever. Now, in the long and punishing battle between the defiant champions of the New Jedi Order and the juggernaut that is the Galactic Alliance, the endgame is finally at hand. With so much lost&mdash;and nothing less than the course of the future still at stake&mdash;there can be no turning back. No matter the consequences.''

''The rebel cause is losing ground under the twin blows of Admiral Gilad Pellaeon’s assassination and the death of Mara Jade Skywalker. At the same time, having gained the support of the Imperial Remnant and its ruthlessly efficient forces, the Galactic Alliance, with the extraordinary power and dark brilliance of newly ascendant Sith Lord Darth Caedus at its helm, may be unstoppable. Tormented and torn between the call of duty and the thirst for vengeance, Luke has searched the Force and beheld an unspeakable vision of the galaxy enslaved under tyranny more monstrous than even Palpatine’s. Now it seems that the last, best hope lies in mobilizing the scattered Jedi for one decisive search-and-destroy mission. The objective: eliminate Darth Caedus.''

''It’s a plan that will be as difficult and dangerous to execute as it is daring. For Caedus is a scion of both the Skywalker and Solo bloodlines whose command of the Force surpasses even that of his grandfather Darth Vader. There is only one who is bound by destiny to stand against him in what will surely be a duel to the death, only one with an outside chance of bringing down the dark lord who was once Jacen Solo.''

''Failure is not an option. The furious final moments between power and peace are here, and whoever confronts Darth Caedus will decide the outcome&mdash;and the fate of those left standing.''

Paperback
'''In the epic battle between the defiant champions of the New Jedi Order and the juggernaut that is the Galactic Alliance, the endgame is finally at hand. With so much lost&mdash;and nothing less than the course of the future at stake&mdash;there can be no turning back. No matter the consequences.'''

''The rebel cause is losing ground under the twin blows of Admiral Gilad Pellaeon's assassination and the death of Mara Jade Skywalker. The Galactic Alliance, with the extraordinary power of the newly ascendant Sith Lord Darth Caedus at its helm, may be unstoppable. Tormented and torn between the call of duty and the thirst for vengeance, Luke Skywalker has searched the Force and beheld an unspeakable vision of the galaxy enslaved under tyranny more monstrous than even Emperor Palpatine's. It seems that the last, best hope lies in mobilizing the scattered Jedi for one decisive search-and-destroy mission. The objective: eliminate Darth Caedus. There is only one who is bound by destiny to stand against him in what will surely be a duel to the death, only one with any chance of bringing down the dark lord who was once Jacen Solo...''

Plot summary
The novel starts off with a flashback to when Jaina and Jacen Solo were teenagers trying to escape from a space station, and Jaina knows that she can always rely on her brother as an ally. The book has a few other flashbacks like these to show the relationship that Jaina and Jacen once had compared to their relationship in this book.

Cutting over to 41 ABY, Jaina and Boba Fett travel throughout the interior of Nickel One as Darth Caedus's Galactic Alliance and Imperial Remnant forces raid the asteroid during the First Battle of Roche. Jaina and Fett find that the Remnant is using some sort of aerosol nanokiller attack used to kill the Verpines working in the asteroid. Jaina leaves at Fett's command to get back to the Jedi Coalition while he stays behind to do as best he can to fight off the invaders with the Verpines in order to honor his mutual-aid treaty with them.

Jaina makes it back to the Jedi base at Shedu Maad where she, her family and the rest of the Jedi High Council plan to sneak onto Coruscant and get information as to Darth Caedus's whereabouts. Later, on Coruscant, Ben Skywalker meets up with his friend and Galactic Alliance Guard spy Lon Shevu who discreetly tells Ben that Caedus is located at Nickel One. Unfortunately, Ben figures out that they are being spied upon by the rest of the GAG, and he tries to escape, resulting in the Skirmish on Coruscant. But Ben is captured by Tahiri Veila and her forces, along with Shevu, who is arrested for aiding Ben in his failed escape. Jaina and her mother, Leia, try to save Ben using a commandeered medical frigate, but they run headlong into a GAG ambush that forces Jaina to abandon Ben on Coruscant as she and her mother make their escape.

Despite Ben's capture, his father, Luke, tells Jaina and her parents, when they get back to Shedu Maad, that he expected Ben to get captured because he had foreseen it in his visions, as he had been countering Caedus's own powers to muddy his visions. This is so that when Jaina would finally meet Caedus in a duel to the death, the Sith Lord would not expect it coming. The only reason that Luke himself will not go after Caedus, as he is clearly more powerful than him, is that when Luke killed Lumiya in vengeance for the death of his wife, Mara, he had been tainted by the dark side of the Force. And knowing that Caedus is Mara's actual killer, Luke also knows that he would end Caedus not for the good of the galaxy, but because to enact his vengeance, thus losing himself to the dark side completely. Now, in the aftermath of Ben's capture, Luke had also foreseen Ben getting his information from Shevu, which had reveals to the Jedi Coalition that Caedus is at Nickel One.

Luke, Leia, her husband Han, Saba Sebatyne and Jaina all take a Skipray 24r Blastboat to Nickel One. While Saba, the Skywalkers and the elder Solos distract Caedus's holding forces with the help of Fett and the Mandalorians, Jaina inserts herself into Nickel One to carry out killing her brother. She meets up with the dispatched Mandalorian forces inside who were sent by Fett to kill the Moff Council. The Mandalorians invade the meeting room where the Moffs hold their meetings, and fight off their guards and stormtroopers as Jaina finds herself a sniping position for when Caedus would reveal himself in the battle. He shows up, but does not give Jaina an opportunity to take him down as he defeats the rest of the Mandalorian forces. He then tells the Moffs and the remaining two stormtroopers to find a safe location while he deals with the sniper, who he does not know is Jaina. Jaina and Caedus then lightsaber duel, but the latter thinks that the former is Luke. However, at the end of the fight, when Jaina cuts off his arm and Caedus immobolizes her with Force lightning, Luke loses hold of Jaina through the Force, thus shattering the illusion cast upon to the Sith Lord, and Caedus sees his real opponent. Jaina then escapes, having failed her mission and too wounded to carry on, and Caedus is left believing that Luke was physically involved in the fight. And after Jaina recovers from her injuries, having returned to the Jedi Coalition, she finds that Caedus has left a blood trail on her that is used in a similar technique harnessed by the Nightsisters of Dathomir, as it can have anyone who put the blood mark on the individual be able to track the latter down. When Luke discovers this, he declares to everyone else in the Coalition that Caedus will now track them down to Shedu Maad and possibly obliterate them if they do not fight back.

Back on Coruscant, Tahiri interrogates Ben as to where the Jedi base is, but when he refuses to comply, Tahiri uses Shevu's life as leverage. Ben relents, and Tahiri electrocutes Shevu to death. However, she is horrified at what she has done, and Ben manages to escape, knocks Tahiri unconscious, threatens the guards into compliance and manages to get Shevu's body properly disposed of. Then he later gets a message telling him to meet someone he is familiar with at Nova Station, and meets up with Hapan Queen Mother Tenel Ka Djo's cousins, Trista and Taryn Zel, who agree to ship him back to Shedu Maad. However, Caedus's fleet tracks him down and attempts to take the Zels' ship, the Blue Slipper. But Prince Isolder's fleet manages to counter Caedus and allow for Ben and the Zels to escape. However, Isolder's fleet is defeated and captured. Ben arrives back at Shedu Maad and is aprised of the fact that Caedus now knows where the base is, thanks to Jaina's mark. The entire Jedi Coalition, along with the help of the Hapes Consortium, prepare for battle against Caedus.

As Caedus's fleet arrives in the Maad system and battles off the forces of the Jedi Coalition, Jaina manages to get aboard the dying Anakin Solo, as it has been weakening thanks to the attacks brought upon it by the Coalition's forces. However, Zekk has been lost in the raid, and his fate becomes unknown for the rest of the battle. Meanwhile, Caedus finds out that the Moffs have managed to create a nanokiller from Isolder's biology that they plan to bring onto Tenel Ka's flagship, the Dragon Queen, and kill everyone aboard of royal bloodline to level the playing field in the battle where the Hapans are concerned. Caedus disallows this, although he even knows that they are lying about their compliance. The Sith Lord, when asked by Tahiri why he simply cannot go back in time and fix such problems with flow-walking, then reveals to her that going back in time to see the late Anakin Solo did not really change the past, as the flow-walks have been too insignificant to be of any consequence. Though she hates him for deceiving her in such a way, Tahiri remains loyal to Caedus and goes down to Shedu Maad to plant a bomb that can wipe out the Coalition's base. Then Caedus tries to enlist Isolder's help in trying to stop the Moffs from unleashing their nanokiller against those board the Dragon Queen. Isolder believes that Caedus is lying, which forces the Sith Lord to break the prince's neck, killing him. Then Caedus takes Isolder's body to an immolation pit to dispose of the corpse, but Jaina tracks him down there and they duel again. Caedus tries to convince Jaina that he needs to save Tenel Ka and his daughter, Allana, from the Moffs' nanokiller, but Jaina thinks that he is lying, like Isolder. Their fight continues, and they both sustain many injuries. But eventually, Caedus's injuries become too great for him to carry on, so rather than wasting the last of his life against Jaina, he becomes Jacen Solo again and alerts Tenel Ka of the danger that she and Allana face. He is unable to complete this warning before Jaina strikes him down with her lightsaber, ending Darth Caedus's life just as his sister realizes what he was trying to do.

On Shadu Maad, Ben confronts Tahiri and stops her from activating the baradium bomb to destroy the Jedi base. Making her see that she is a better person than Caedus, Tahiri is redeemed and she turns back to the Jedi's side. Meanwhile, aboard the Anakin Solo, the Coalition forces defeat Caedus's GA forces and round up the Moffs. They threaten to unleash them to the Hapans for their nanokiller attack on the Dragon Queen, which killed many of royal bloodline, such as Allana, but not Tenel Ka, and unless the Moffs let Jagged Fel rule the Imperial Remnant, they will face certain death by the Hapes Consortium. The Moffs let Jag become their ruler and agree to help clean up the mess that the Second Galactic Civil War has brought upon to other planets. The Solos, despite all that Caedus has done, fall into grief over his death, as he was still Han and Leia's son, and Jaina's brother. What is worse is that Jaina failed to believe that Caedus had told the truth about trying to save Tenel Ka and Allana, and that she had killed him when he became Jacen again in order to alarm Tenel Ka of the nanovirus attack. This makes Jaina evaluate what being the Sword of the Jedi really means.

The novel, and the series, ends as Jaina is recovering from her injuries from her last duel with Caedus. Han and Leia show that in a way, Caedus had won the war, as the worlds of the Confederation and the Imperial Remnant have allied to restore the Galactic Alliance, bringing a united galaxy that Caedus had sought for. Natasi Daala is the new Chief of State, Zekk remains missing and it turns out that Allana had survived the nanokiller attack. The incomplete warning that Jacen had given Tenel Ka through the Force was enough to to save herself and Allana from the nanokiller, and then the Queen Mother had given Allana, renamed Amelia, a war orphan, to Han and Leia so that, with everyone else believing that she is dead, no one will go after her via Hapan assassination. Jaina fondly accepts "Amelia" into the Solo family.

Appearances
{{App
 * dramatis personae=
 * Ben Skywalker; Jedi Knight (human male)
 * Boba Fett; Mandalorian bounty hunter, Mand'alor (human male)
 * Darth Caedus (formerly Jacen Solo); Sith Lord (human male)
 * Han Solo; captain, Millennium Falcon (human male)
 * Jagged Fel; Jedi support pilot (human male)
 * Jaina Solo; Jedi Knight (human female)
 * Leia Organa Solo; Jedi Knight (human female)
 * Lon Shevu; captain, Galactic Alliance Guard (human male)
 * Luke Skywalker; Jedi Grand Master (human male)
 * Mirta Gev; Mandalorian bounty hunter (human female)
 * Prince Isolder; father to the Hapan Queen Mother (human male)
 * Saba Sebatyne; Jedi Master (Barabel female)
 * Tahiri Veila; Sith apprentice (human female)
 * Taryn Zel; Hapan Security operative (human female)
 * Tenel Ka; Hapan Queen Mother (human female)
 * Trista Zel; Hapan Security operative (human female)
 * Zekk; Jedi Knight (human male)
 * Zekk; Jedi Knight (human male)


 * other characters=
 * Allana
 * Atoko
 * Berit
 * Goran Beviin
 * Voryam Bhao
 * Nek Bwua'tu
 * C-3PO
 * Anni Capstan
 * CeeCee
 * Chewbacca
 * Ta'a Chume
 * Cilghal
 * Gavin Darklighter
 * Natasi Daala
 * Derek
 * Dex
 * Kyp Durron
 * Soontir Fel
 * Borsk Fey'lya
 * Garsi
 * H449-B7
 * Kenth Hamner
 * Corran Horn
 * Jat'ho
 * Qui-Gon Jinn
 * Jowar
 * Kyle Katarn
 * Obi-Wan Kenobi
 * Darth Krayt
 * Exar Kun
 * Drikl Lecersen
 * Livette
 * Lowbacca
 * Lumiya
 * Moburi
 * Freedon Nadd
 * Cha Niathal
 * Osos Niskooen
 * Onimi
 * Ghes Orade
 * Orlopp
 * Gilad Pellaeon
 * Qade
 * R2-D2
 * Alema Rar
 * Vitor Reige
 * Requud {{C|Voice only}}
 * Krom Rethway
 * Rezer
 * Roegr
 * Roegr's brother
 * Naga Sadow
 * Barit Saiy
 * Sangi
 * SD-XX
 * Tesar Sebatyne
 * Fenn Shysa
 * Darth Sidious
 * Sass Sikili
 * Shula Shevu
 * Mara Jade Skywalker
 * Sneaky
 * Anakin Solo
 * Ss'ess
 * Vatok Tawr
 * Patra Tebut
 * Tekli
 * Raynar Thul
 * Three-Eye
 * Jabba Desilijic Tiure
 * Tobyl
 * Unidentified Big Boom bartender
 * Unidentified captain
 * Darth Vader
 * Ailyn Vel
 * Sintas Vel
 * Vergere
 * Kosimo Westermal
 * Mace Windu
 * Wyrlan
 * Yoda
 * Yoda


 * creatures=
 * Bantha
 * Kreetle
 * M'onnok
 * Narglatch
 * Rancor
 * Rat-monkey
 * Reek
 * Ronto
 * Sarlacc
 * Shenbit bonecrusher
 * Velker
 * Wampa
 * Yorik coral
 * Yorik coral


 * droids=
 * Astromech droid
 * R-series
 * R2-series astromech droid
 * Battle droid
 * YVH-series battle droid
 * Medical droid
 * 2-1B surgical droid
 * GP-2 medical droid
 * Protocol droid
 * 3PO-series protocol droid


 * events=
 * Clone Wars
 * Showdown on Coruscant
 * Battle of the Great Pit of Carkoon
 * Yuuzhan Vong War
 * Battle of Ithor
 * Mission to Myrkr
 * Second Galactic Civil War
 * Undercity Ambush {{Imo}}
 * Battle of Kashyyyk
 * Battle of Mandalore
 * Battle of Shedu Maad
 * Skirmish on Kavan
 * Duel on Terephon
 * First Battle of Roche
 * Second Battle of Fondor
 * Second Battle of Roche
 * Second Duel on the Anakin Solo
 * Wedding of Ghes Orade and Mirta Gev


 * locations=
 * Carbos Thirteen
 * Carida system
 * Carida Nebula
 * Nova Station
 * Big Boom cantina
 * Csilla
 * Coruscant
 * Galactic Justice Center
 * General Crix Madine Military Reserve
 * House of Plastex
 * Mizobon spaceport
 * Monument Plaza
 * Borsk Fey'lya Center
 * Curat Commercial Center
 * Devoted Technician
 * Traveler's Palace
 * Dagobah
 * Fondor
 * Gamorr
 * Hapes Cluster
 * Terephon
 * Transitory Mists
 * Qogo
 * Shedu Maad
 * Uluq
 * Uroro Station
 * Kavan
 * Ithor
 * Kashyyyk {{Mo}}
 * Maltorian mining belt {{Mo}}
 * Mandalore {{Mo}}
 * Keldabe {{Mo}}
 * Fenn Shysa's memorial {{Mo}}
 * Mon Calamari {{Mo}}
 * Mustafar {{Mo}}
 * Roche system
 * Roche asteroid field
 * Nickel One
 * Knob Nose Transfer Facility
 * Carbon Fifteen
 * HighGround RockyPlain TwentyKilometer Left
 * Tatooine {{Imo}}
 * Dune Sea {{Mo}}
 * Vaklin {{Mo}}
 * Woteba {{Mo}}
 * Yavin 4 {{Mo}}
 * Jedi Praxeum {{Mo}}}
 * Jedi Praxeum {{Mo}}}


 * organizations=
 * Alliance-in-exile
 * Chiss Ascendancy {{Mo}}
 * Clone troopers {{Mo}}
 * Confederation
 * Corporate Sector
 * Galactic Empire {{Mo}}
 * Galactic Federation of Free Alliances
 * Galactic Alliance Guard
 * Reconstruction Authority {{Mo}}
 * Reconstruction Authority Space Patrol
 * Galactic Republic {{Mo}}
 * Hapes Consortium
 * Hapan Signals Intelligence
 * Mist Patrol
 * Imperial Mission {{Mo}}
 * Imperial Remnant
 * Moff Council
 * Stormtrooper Corps
 * Imperial Elite Guard
 * Stormtrooper
 * Jedi Coalition
 * Jedi Order {{Imo}}
 * Jedi General {{Mo}}
 * Lumiya's Sith
 * Sith Lord
 * Sith apprentice
 * Mandalorian
 * Mandalore
 * New Jedi Order
 * Grand Master
 * Jedi Master
 * Jedi Knight
 * Jedi Apprentice
 * Circle of Jedi Healers
 * Jedi Council
 * Sword of the Jedi
 * Nightsisters {{Mo}}
 * Rogue Squadron
 * Shadow Academy
 * Shadow Academy


 * species=
 * Aing-Tii {{Mo}}
 * Arcona
 * Arkanian
 * Barabel
 * Bith
 * Bothan
 * Codru-Ji
 * Devaronian
 * Duros
 * Dug {{Mo}}
 * Elomin
 * Falleen
 * Gamorrean {{Mo}}
 * Human
 * Hutt
 * Ishi Tib
 * Kaminoan {{Mo}}
 * Kiffar
 * Killik {{Mo}}
 * Mon Calamari
 * Rodian
 * Squib
 * Sullustan
 * Twi'lek
 * Verpine
 * Wookiee
 * Yuuzhan Vong {{Mo}}
 * Zeltron {{Mo}}
 * Zeltron {{Mo}}


 * vehicles=
 * Baanu Rass {{Mo}}
 * Batag Skiff
 * Blue Slipper
 * Beam Racer
 * Bes'uliik
 * Cutlass-class corvette
 * Doomsled
 * Hapan Battle Dragon
 * Deserving Gem
 * Dragon Queen
 * Loyal Dragon
 * Imperial II-class Star Destroyer
 * Anakin Solo
 * Biodisposal Pit
 * Chimaera
 * Harbinger
 * Miy'til starfighter
 * Ocean
 * Owool Interceptor
 * Ralroost
 * Scimitar-class frigate
 * Skipray 24r Blastboat
 * StealthX
 * Starhunter
 * Super Star Destroyer
 * Dominion
 * Megador
 * Sweet Time
 * Tachyon Flier {{Mo}}
 * TIE/IN interceptor
 * TIE/LN starfighter {{Mo}}
 * Tra'kad
 * Turbulent-class Star Destroyer
 * Bloodfin {{Mo}}
 * XJ7 X-wing starfighter
 * YT-1300 light freighter
 * Millennium Falcon
 * Millennium Falcon


 * technology=
 * Armor
 * Mandalorian armor
 * Stormtrooper armor
 * Automated slicer
 * Beskad
 * Bioskan
 * Blaster
 * Blaster carbine
 * EE-3 carbine rifle {{Mo}}
 * Blaster rifle
 * E-18 blaster rifle
 * BlasTech S330
 * G-8 power blaster
 * G-10 power blaster
 * Repeating blaster
 * E-Web heavy repeating blaster
 * Breath mask
 * Stink-mask
 * Chronometer {{Mo}}
 * Cluster mine
 * Coma gas {{Mo}}
 * Comlink
 * Concussion grenade
 * Dart thrower
 * Dropsuit {{1st}}
 * FlakBlaster Ten {{1st}}
 * Grenade
 * Fragmentation grenade
 * Thermal detonator {{Mo}}
 * Heads-up display
 * Hologram
 * Light repeating blaster
 * T-21 light repeating blaster
 * Lightsaber
 * Darth Caedus' lightsaber
 * Ben Skywalker's lightsaer
 * Jaina Solo's lightsaber
 * Mandalorian iron
 * Medkit
 * Medpac
 * Nanovirus
 * Plasticuffs
 * Ryyk blade {{Mo}}
 * Shadow bomb
 * Sniper rifle
 * QuietSnipe {{1st}}
 * Vambrace
 * Vambrace

}}
 * miscellanea=
 * Airsplint
 * BattleSun Odyssey
 * Bacta
 * Cheruban glach race
 * Dyeball
 * Electrotex
 * Enzobleach
 * Flimsiplast
 * Newsflimsi {{1st}}
 * Fogblaster
 * Frezgel
 * Goff-milk {{1st}}
 * Homogoni
 * Hyperspace {{Mo}}
 * Ilinium {{Mo}}
 * Kolg tree {{1st}}
 * Lightsaber combat
 * Cho mok
 * Sai tok
 * Shiak
 * Sun djem
 * Maboo cane {{1st}}
 * Marriage {{Mo}}
 * Mirror
 * Myocardial infarction
 * Nelab stew
 * Plastoid
 * Relephonian sarsestone {{1st}}
 * Soap {{Mo}}
 * Sterinumb
 * Synthatex
 * The Force
 * Aing-Tii fighting sight {{1st}}
 * Battle meditation
 * Blood trail {{1st}}
 * Breath control
 * Flow-walking {{Mo}}
 * Force-flash
 * Force block
 * Force bond {{Mo}}
 * Force deflection
 * Force euphoria
 * Force healing {{Mo}}
 * Force Jump
 * Force lightning
 * Force shock
 * Force meld
 * Force stealth
 * Force vision
 * Force zap
 * Memory rub {{Mo}}
 * Mind trick
 * Force illusion
 * Shatterpoint
 * Telekinesis
 * Force blast
 * Force choke
 * Force pull
 * Force push
 * Vardium steel
 * Yoba {{1st}}
 * Zeltron Shift
 * Zeltron Shift

Behind the scenes
Each chapter begins with a joke told by Jacen Solo when he was a teenager (young Jedi) training at the Jedi Praxeum on Yavin 4. Many of these were taken from the Young Jedi Knights series of young reader novels, though the authors acknowledgments state that some original material was also contributed by Andria Hayday and Sue Rostoni.

In the Audiobook version the name of Onimi (mentioned once) is pronounced differently than in the New Jedi Order Audiobooks.

During the 2009 San Diego Comic Con Fate of the Jedi panel, author Troy Denning revealed that he had written an alternate ending for the series in which Flow Walking would be used to bring Anakin Solo back to life. “...I’ve now killed off both the Solo boys. I didn’t want to, so I tried to come up with a way to make up for such a dark ending to that story arc…”

Unlike most other Star Wars novels, Invincible has a much tighter narrative focus, with Jaina being the primary character from whom the story is told. The only other characters to have their point-of-views represented in this novel are Darth Caedus, Ben Skywalker, and Han Solo.

This book marks the only time that Boba Fett and Mirta Gev appears in a Legacy of the Force novel not written by Karen Traviss.

As of this novel, the only characters to appear in each of Troy Denning's entries in Legacy of the Force are Jacen Solo / Darth Caedus, Jaina Solo, Zekk, Luke Skywalker, Ben Skywalker, Han Solo, Leia Organa Solo, Tenel Ka Djo, and Nek Bwua'tu. Also as of this novel, the only characters to appear in all nine Legacy of the Force novels were Jacen / Caedus, Jaina, Luke, Ben, Han, and Leia.

Working titles for Invincible included Maelstrom and Descent.

Original outline
In the original outline for Invincible, Caedus would have continued  to flow-walk back to the Mission to Myrkr in order to further corrupt Tahiri as his apprentice. During his final duel with Jaina he would have conjured up an image of their mortally wounded brother Anakin to vex his sister; however, by reaching into the past he would have made contact and switched places with Anakin. The events of the past would not have been altered; however, Anakin's body would be Darth Caedus in disguise instead. Anakin would have been transfered to the future, when he would have been resuscitated by Jaina. Ultimately, this idea was rejected and the ending was never explored beyond just being suggested.

Mistakes
The cover incorrectly shows Caedus with both arms holding his lightsaber. Jaina fights Caedus twice in the book, but the first time one of his arms was disabled and the second time he only had one arm.