Xaviax

General Xaviax is an alien who defeated the Kamen Riders to conquer Ventara before turning his attention to conquer Earth with his monsters gathering humans to set up his master plan of abducting all humans on Earth to be his slaves in rebuilding his home world.

Backstory
General Xaviax is an alien from planet Karsh. His world was destroyed by a war, between the planet's north (led by Xaviax) and its south. Though the north won, they left the planet in ruins. Under Xaviax's orders, Eubulon created teleportation beacons and went to the planet of Ventarra to place them and abdduct them. However, Eubulon, after falling ill & recovering with help from a Ventarran family tried to convince Xaviax that they'd have to find another way to save Karsh. Xaviax however thought that Eubulon betrayed his kind and decided to enslave the Ventarran's himself. Eubulon warned the leaders of Ventarra and created the Kamen Riders to defend the planet, becoming the Advent Master. Eventually Eubulon and Xaviax fought and their battle ended in a stalemate as both were disabled. Eubulon had been vented and sent to Earth - Xaviax was able to recover more quickly and by unknown reasons, he lived through the fight.

Some time afterwords, during the time Adam, the original Kamen Rider Dragon Knight, was assigned to patrol Ventara while the others were in a state of suspended animation, he had approached Adam under the guise of 'Paragon' another Karsh refugee and a supposed friend of Eubulon and convinced Adam that he could unlink the Riders from their decks. Adam took Xaviax to the base to wake up the other Riders in order to give them the good news.

But 'Paragon' turned on them and vented all of the Riders except Len and Kase who woke up in time and escape, though he thought Kase had been vented. With the Riders out of the way, Xaviax successfully abducted all of Ventarra.

Regretting his actions Adam secludes himself in an illusion Xaviax created and leaves him there with a Ventaran girl named Sarah. Thus he begins his hunt to eliminate Len, the only Kamen Rider that stands in his way for global domination.

Recruiting Riders
To that end, he uses his shape-shifting powers to find ideal pawns to aid him as his Kamen Riders, tricking some of them into believing they are doing the greater good or offering them something they desire. He has currently displayed only one human form thus far in the series, but takes on different aliases to suit his needs and recruit Riders to his cause.

The first of his disguises is a Preston Family attorney named Walter Conners which he uses to announce Richie's severance from the family fortune.

He later appeared as a mercenary captain named Race Mattock to entice Grant with the idea of being a great fighter of two worlds.

Then, he appeared as a Battle Club tournament official named Charlie Feathers to blackmail Brad. During that time, "Charlie" revealed to Brad that he is Xaviax and gives Brad the option to vent or be vented as Xaviax still has the proof.

He later appeared as a government agent named Special Agent Simons, giving an asthmatic Chris a rare opportunity to serve the United States, albeit in secrecy.

He then appeared before the Cho Brothers with a large sum of cash and the chance to pull off the biggest heist of their careers. When Danny goes rogue after Albert is vented, he wanted Strike to vent him. However, upon news of Kamen Rider Siren's return, he feels uneasy discovering an even bigger threat than Wing Knight. Even when Strike came back with Danny still alive, he does not act against JTC as he knew that he would be outnumbered and decides to leave Danny's fate up to Strike's judgement in which Strike vents him.

Primary Goal
While he has been offering some of the other Riders what they desire for the elimination of Len, one of his primary targets seems to be Kit, as many recent plans involve getting Kit to defect to his side and betraying Wing Knight.

So far he has been unsuccessful, even losing his main bait, Frank Taylor. But soon he decides to take a more direct approach after Siren appears and directly reveal himself to Kit. He reveals that he kidnapped his father, framed him for his arrests and then manipulated his father to bring him to the Advent Deck and Dragredder. He states that Kit was the hardest one to recruit as, unlike the other Riders, he had no vice (like Richie's greed) or ambition (like Chris's desire to be a hero). With the training received by Wing Knight as well as fighting his own Riders and gaining Wing Knight's trust, he believes that it is the best time to recruit Kit. With that, he decides to finally make his offer to Kit: vent Wing Knight and Siren and he will revive Frank Taylor, manipulating Kit's love for his father.

However when Xaviax realizes that Kit can no longer be swayed, he abandons his plans for him meaning that Kit must now be vented. And to help JTC, he reveals a secret Kamen Rider in emergencies, Kamen Rider Wrath. He reveals that the body is in a coma and physically merges with Wrath's body in order to fight the three Riders who stand in his way. While fused with the body, he takes the appearance of Vic Frasier, Wrath's counterpart, instead of his normal form when removing the Rider armor. Xaviax later gives JTC's Advent Deck more power by allowing him to capture two more Advent Beasts and use their former master's abilities as well as fuse them together.

Final Plan
After Strike is vented, Xaviax in Wrath's body manages to attack Dragon Knight and Wing Knight and overpowers both Riders, even in their Survive Modes. He manages to vent Kit, but bails from Vic's body before it disappears to the Advent Void. Xaviax then snatches Kit's Advent Deck and plans to use it against Wing Knight, the last Kamen Rider standing in his way.

His master plan in the series is to kidnap and conquer all of Earth. However, Earth is a Mirror World to Ventara and kidnapping humans one by one is time consuming. So instead, Xaviax has a machine where he can transport a mass amount of humans from Earth to Ventara and use them all as his slaves. But this machine requires specific humans with matching DNA to power this machine. To that end he sends his minions in to kidnap just those people. With Wing Knight, Dragon Knight and other Kamen Riders fighting against him, however, he has to focus on the war against them as well, which delays his plans. But when all but Wing Knight is vented, he returns to his original plan. By planting special devices across the world, it will enable Xaviax to transport all of Earth to Ventara. But after hearing disturbing news of Eubulon's return, he decides to send Adam, the original Dragon Knight, to spy on Len threatening Adam by revealing to Sarah that Adam had betrayed the Riders.

Upon discovering the virus in the system, Xaviax tells Adam to send him a copy of the virus so he could decode and create an anti-virus. However, Adam has continuously failed to inflitrate the Riders, angering Xaviax. He sends monsters to attack Maya to allow Adam the chance to save her as another opportunity to ingratiate himself with the good guys. When Adam manages to gain their trust and acquires the virus for him, he shuts down a transmitter to make it look like Adam was successful and begins to decode the virus. While he was successful, he feels that Adam may turn his back on him so he disguises himself as Eubulon and fights Adam and berates him during the fight, obviously swaying Adam to betray the other Riders once more, this time intentionally. He was able to decode the virus and create the anti-virus with which, he reactivates all the transmitters and begins a countdown to its activation.

Before he uses it, he is confronted by Eubulon. He berates him for abandoning his people on Karsh and appears to have the upper hand against him. He is stopped by Kit, Adam, Len and Kase who he refocuses his attention on. When he attempts to finish them off, the other nine Riders arrive. He tells them that he could have been able to give them anything they wanted, but instead they chose to fight against him. Soon all 13 Riders activate their Link Vents and destroy General Xaviax once and for all.

Abilities
Xaviax possesses several abilites such as


 * Shapeshifting -- the ability to change between his Karshian and human forms
 * Energy Blasts - the ability to generate bolts of blue energy from his hands
 * Life-Force Draining - the ability to drain humans of their life energy
 * The ability to create monsters (through unknown means)
 * Body-Possession - the ability to merge himself with the body of another and control it as if it were his own
 * Final Vent (video game only)- In the Kamen Rider Dragon Knight video game, Xaviax will transport himself and the player to outer space where he summons what appear to be dark versions of the Kamen Riders' Contract Beasts and has them attack the player. He finishes by using a dark version of Wing Knight's Sword Vent to hurl the player into a star before returning them both to Earth.

He is also a skilled user of swords and unarmed combat, able to successfully utlize the Wrath armor while possessing Kamen Rider Wrath's body.

Alliances

 * James Trademore/Kamen Rider Strike - James was the only Rider who was completely knowledgable of Xaviax's master plan and seemed to be the only person he trusted, capable of witty banter and even seeming enraged when James was vented by Wing Knight.

Minions

 * Newt Minions
 * White Minions
 * Blue Minions
 * Mirror Monsters