Dark Signer

The Dark Signers are a mysterious group of duelists, who serve as antagonists to the Signers and primary antagonists for the second arc of Yu-Gi-Oh! 5D's.

When a person dies, he or she is given a chance to live by becoming a Dark Signer at the time of death. If they display a great will to live or a reason for revenge, an Earthbound Immortal may spare them turning them into a Dark Signer in the process. However due to this phenomenon which derives from the Netherworld itself, there's no way to revert the transformation. As a Dark Signer, those individuals are given a great power and a great lust for revenge. All of the Dark Signers, with the exception of Carly, hold some form a grudge against a Signer, which would provide an answer to why the Earthbound Immortals chose them. They are said to be no longer of the living world and incapable of reverting to their former selves.

Thus because of this distinctive group of individuals already had died once, it is seen that once they have been defeated in their own Shadow Duel or Shadow Turbo Duel for that matter, their departure from this world would be completely different. As instead of simply dying like a normal human being, they instead would wither until they become dust.

They are capable of using a distinctive new type of monsters known as Dark Synchro Monsters which are black lined. Their Signature Card are the "Earthbound Immortals", along with the use of Field Spell cards in order to maintain the effects of these powerful beasts in a Duel. There are only five dark Signers at any given time each one possessed by a different geoglyph.

History
The Earthbound Immortals are evil entities that were sealed in the Nazca Lines by the Crimson Dragon and the Five Dragons. Each one bore a dark mark on to five individuals who are known as the Dark Signers.

The Dark Signers possess an inborn drive to defeat the Signers, whom each has a marking of the Crimson Dragon, over the course of 5.000 years.

The Dark Signers serve as gatekeepers to the door to the netherworld. This door resides within the first Enerdy Reactor, located in Satellite. The Dark Signers plotted to open this gate to release the Earthbound Immortals. Knowing this, Rex Goodwin built the utopia New Domino City away from Satellite and restricted access between the two cities so that only those left in the Satellite would be harmed when this time came.

Rex's older brother, Roman, was placed in charge of the first Enerdy Reactor, developed by Professor Fudo prior to the Zero Reverse Incident. The same incident which released the sealed Immortals from their 5.000 year imprisonment. Presumed killed by the accident, Roman was reawakened as a Dark Signer.

Kalin became a Dark Signer after being sentenced to death but came back, fueled with revenge against his former friend Yusei Fudo.

At a certain point Misty Tredwell was transformed while suffering in hospital. After being spared, she was told by Ccarayhua to kill the servant of the Crimson Dragon, "Black Rose Dragon". Her hatred for the Black Rose duelist for allegedly killing her brother easily put Misty on this task.

After the Crimson Dragon appeared during the Fortune Cup, the Dark Signers began preaching in Satellite that the Crimson Dragon is evil and encouraged the people to stand with them for the sake of Satellite.

Using brainwashed victims, they began targeting the Signers, including Yusei Fudo and Jack Atlas, who were made to duel Dick Pitt and Trudge respectively. Jack, however, dueled with Carly's assistance. In both cases, the Signers emerged victorious.

Kalin targeted Yusei in Satellite and faced him in a Shadow Turbo Duel. He Summoned his Earthbound Immortal, "Ccapac Apu", which absorbed the souls of many residents. Yusei was unable to finish the Duel due to an injury caused by his Duel Runner failing.

Carly was thrown off the Arcadia Movement building by Sayer, but was spared from death by an Earthbound Immortal. Misty sensed this and proceeded to the Arcadia Movement in order to face the Black Rose, Akiza Izinski. Carly faced Sayer in a rematch. Both Dark Signers Summoned their Earthbound Immortals, absorbing the souls of bystanders. Meanwhile, Devack was able to free Greiger from a police wagon due to the guards' souls having been absorbed. Carly defeated Sayer with "Aslla Piscu", causing the building to fall apart and Sayer dropping, past the inside balconies. Misty and Akiza's Duel was interrupted and postponed due to the collapsing building.

The Signers learned from Rex Goodwin about the nature of the Dark Signers dueling powers. Yusei, determined to save Kalin, questions Goodwin about returning them to normal. Goodwin reluctantly tells them that the change cannot be reverted as they are no longer of this world.



After a dark ritual performed by the Dark Signers in the B.A.D. area, mysterious black fog covers all of Satellite, absorbing all residents near this zone, seemingly including Crow.

After Roman's Shadow Duel against Yusei concludes, the rest of the Dark Signers show themselves to their rivals, the Signers, as their final battle is about to begin. Currently, each Signer travels to one of the four control units for the Original Enerdy Reactor where their corresponding rival is awating. However, as Luna and Leo are taken by Trudge to the controller where Devack is, she is instead transported back to the Minus World in order to free Ancient Fairy Dragon. This causes Leo to duel Devack in her place, trying to fulfill his promise of protecting her. After Devack summons his Cusillu, Luna returns from the Spirit World and takes Leo's place. Once Devack sacrificed Ancient Fairy Dragon, in order to activate Cusillu's effect, Luna uses Respect Synchron to summon Ancient Fairy Dragon to her side of the field thus releasing her and using her and Power Tool Dragon to destroy Cusillu and defeat Devack.

Despite Devack's defeat and the apparent destruction of Cusillu, the Dark Signers prove to have a contingency plan. Greiger soon becomes his replacement, using a sixth Earthbound Immortal, Chacu Challhua. Later Greiger duels against Crow, whom had managed to escaped the fog. Later during the duel, as the new Dark Signer summons his correspondent God, he ultimately finds out the truth about his village: the ones responsible for the destruction of it are actually the same individuals he now works for. Discovering this Greiger loses his will to continue the duel, but suddenly a dark and evil voice known only as an "Envoy of the Underworld" intervenes. The entity possesses him in order to force the duel to continue. In the end, the possessed Greiger is defeated by Crow in the Shadow Turbo Duel, during which Chacu Challhua is destroyed as well.

With his detours settled, Yusei finally reaches the Giant's control unit, and Kalin. Their duel is intense as Yusei tries to save him while Kalin justs wants revenge. As more of the past of the Enforcers is revealed, including Kalin's final moments before becoming a Dark Signer, he Summons Ccapac Apu and tries to destroy Yusei with it. However, as he manages to fend off from the Earthbound Immortal's assault, the Nazca God itself begins to trash the ground where the duel is taking place. As Kalin then experiences difficulties with this Yusei tries to save him by summoning "Majestic Star Dragon" and taking down Ccapac Apu. As Kalin makes peace with him, however, still he withers into dust.

After the battle, Roman speaks to Yusei through Trudge as he challenges him. Therefore he along with Crow, Luna, Leo and Trudge goes to the Original Enerdy Reactor. As they meet with Roman inside he detonates the Enerdy Reactor, thus releasing the negative energy inside. As it fills the room, the two of them, who are above it, finally begins their rematch. During the duel he reveals to him some unfortunate events which occurred between the Dark Signer and Professor Fudo. Roman also reveals his identity as the fifth Signer. After Yusei finally manages to defeat Uru, and thereby Roman, Roman detonates his left arm as he's dissapearing, blowing up the bridge and sending Yusei falling into the depths of the Enerdy Reactor.



Meanwhile Jack, who has finally reached the Hummingbird tower, is surprised as Carly appears, riding her own Duel Runner. Afterwards, they both engage in a Shadow Turbo Duel. As Carly is able to deplenish most of his life points, Jack is, however, able to turn Carly back into to her righteous self. Unfortunately the "Envoy of the Underworld", upon seeing this, appears to posses her and force the duel to go on. As Carly summons Aslla Piscu, Jack eventually manages to turn the situation around by summoning Savior Demon Dragon. However, as he attempts to end the duel in a tie, Carly instead destroys Aslla Piscu and takes damage because of it. She loses the duel and vanishes as they are both hugging.

Finally Misty who is guarding the last control Tower is waiting for Akiza while mourning for her dead brother, Toby. Eventually Akiza and Mina arrive where the Lizard Tower is situated, in an old and abandoned carnival. Thus Akiza finds Misty, and has been guided by her into a House of Mirror where they finally commenced their rematch. As it begins Misty recounts the events that lead up to Toby’s death that undoubtedly involves Akiza, through the use of her Sad Story Spells and Bad End Trap. Because of this Akiza who is now tormented by the truth, loses the will to continue the duel. However Sayer appears to save her from landing into a shard of shattered glass, but has now deviously has awakens her powers as the Black Rose once again.

However while Misty in the end has summon her powerful Bad End Queen Dragon, Akiza in the other hand has not only unleashed her Black Rose Dragon, but also ultimately has shattered every mirror in the vicinity and finally confronts face to face with her opponent. Akiza and Misty's duel continue while Misty manages to gain the upper hand by summoning Ccarayhua. While she does that Yusei tricks Sayer in revealing the truth behind her brother's death. Upon hearing this she commands her monster to devour him and avenges her brother's death. Before she could surrender the Envoy of the Underworld takes control and is about to finish Akiza off with a direct attack. But Akiza pulls through by blocking the attack and summoning Black Rose Dragon again to destroy everything on the field. Misty tries to counter by inflicting damage through card effect. But Akiza counters the damage and deals it back to her ending the duel with Misty feeling at peace. She vanishes leaving her music box, containing Toby’s and her picture on it.

Later, right after Akiza’s duel against Misty concludes, before the Signers are able to seal the last Tower, the King of the Underworld appears from the Original Enerdy Reactor, and is moving toward New Domino City. At that time Goodwin who has acquired the powers of a Signer with Roman's arm, reveals to be the last of the Dark Signers. As the dark mark of the Condor appearing on his back, revealing his Dark Signer nature and giving him supernatural powers, he declares that a Shadow Turbo Duel will be held within the Condor geoglyph as a ritual to welcome the King of the Underworld.

Therefore Goodwin faces of against Yusei, Jack, and Crow in one final Shadow Turbo Duel. The duel rages fiercely upon them and Goodwin. Though both Jack and Crow are unable to continue due to Wiraqocha Rasca's deathly effect, Yusei manages to win with both their help.



After the King of the Underworld is finally destroyed by the combined power of Yusei, Majestic Star Dragon, and the Crimson Dragon, all of the other Dark Signers were returned to life, leaving only the Goodwin brothers to pass on to the afterlife. Afterwards, the city and Satellite return to normal, the former Dark Signers apparently have no recollection of ever being one, judging by Carly's statement.

Brainwashing
Roman has the ability to brainwash other people, by having a black spider latch onto a victim. The victim believes themself to be a Dark Signer, gains the spider dark mark and does the bidding of the real Dark Signers. While brainwashed, the victim's Duels become Shadow Duels and their Deck is changed to one more fitting to a Dark Signer. In the English version the brainwashed person is known as a Shadow Drone, while in the Japanese they refer to themelves as actual Dark Signers.

The spell is lifted when the victim loses a Duel. At this point the spider is ejected from their body and erupts in a powder. The victim's Deck is then restored to normal and they have no memory of what happened while they were brainwashed.

People who become real Dark Signers are believed to be brainwashed. Their motives are fueled by revenge. While some accept it to be their own free will, it appears that when this hatred motives are no longer pursued, is to then that the individual will then be possesed by an unknown evil entity. Though this dark entity is powerful as it has forced Greiger, Carly and Misty to continue their duels against their wills.

Shadow Duels

 * Main article: Shadow Duel.



When a Dark Signer engages in a Duel, the arena is surrounded by a forcefield of dark fire, taking the shape of the Dark Signer's respected geoglyph and becomes a Shadow Duel. When a brainwashed Dark Signer servant engages in a Duel, the arena is instead surrounded by a purple glow.

During a Shadow Duel, players suffer real damage when attacked by monsters. The blasts from the attacks are fatal and often cause damage to the surroundings. Also, according to Sayer during his duel with Carly Carmine in episode 39, the effects from a Shadow Duel are more powerful and deadlier than that of Psychic Dueling.

Dark Synchro Summoning

 * Main article: Dark Synchro Summon.

The Dark Synchro and Dark Tuner monsters are exclusive to the Dark Signers and Shadow Drones. Dark Synchro Monsters are Synchro Summoned by sending to the Graveyard 1 Dark Tuner monster and 1 non-Dark Tuner Monster. The non-Dark Tuner Monster's Level minus the Dark Tuner Monster's Level must be equal to the Dark Synchro Monster's Level, which is negative. Currently Negative Levels do not exist in the real life card game.