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English name
  • Devack
Japanese translated
  • Demak
  • Male
Previous organization

Dark Signers

Anime Deck


Anime debut

Yu-Gi-Oh! 5D's episode 027: "A Web of Deceit, Part 1"

Video game debut

Yu-Gi-Oh! 5D's Tag Force 4

Appears in
Nintendo DS
English voice
  • Scottie Ray
Japanese voice

Devack, known as Demak in the Japanese version, was one of the Dark Signers. He wore the black robes of the Dark Signers that were accented with yellow stripes and his dark mark was the monkey. He freed Greiger from his prison transport, and offered him the chance to fulfill his desire for vengeance. He was also responsible for the Minus Curse that infected the Spirit World with the help of his subordinate, Zeman The Ape King.




Devack had great loyalty to the Dark Signers and for Roman in particular. His final words as he dissolved, he apologized to Roman for losing.[1] He also looked down on those who were not Signers, and enjoyed the pain of others, as seen when he tried to show Luna more sadness by using "Ancient Fairy Dragon" against her.[2]


It is unknown how Devack died and how he became a Dark Signer, or what grudge he had that allowed him to be revived in the first place. At some point upon his rebirth, he met Roman and the other Dark Signers, and pledged his loyalty to Roman. At some point, he was given Ancient Fairy Dragon by Roman, and more than likely set up a confrontation with Luna. He appeared out of the original Ener-D Reactor by arriving by helicopter in order to free Greiger from custody, as his transport guard's souls had been absorbed by the "Earthbound Immortal Ccarayhua". Devack then invited him to join them and get revenge on Rex Goodwin for the destruction of his home town. They later picked up Misty Tredwell and Carly Carmine and returned to the Ener-D reactor.

He finally showed himself to his rivals, the Signers, after Roman's Shadow Duel against Yusei concluded. The final battle between them and their rivals was about to commence.

Before their departure, he showed Luna that he possessed her "Ancient Fairy Dragon" card, and so in order to get it back, she must fight him. Later on, as each one of the Signers was set on defeating their respective opponent, they split up to each of the four control units of the Original Ener-D reactor. As Luna and Leo were taken by Trudge to where Devack was, she instead went into the Duel Monsters Spirit World in order to free Ancient Fairy Dragon from her imprisonment with the the help of her servant, Regulus. However, when Leo found the control unit, Devack approached him while the Monkey geoglyph materialized. Leo then bravely challenged him, and stating that if he defeated the Dark Signer then Luna wouldn't have to Duel him.

Despite Devack's warning that Leo wouldn't be able to save himself and his sister, as he was not a Signer, the duel was still on. Devack was quickly able to inflict damage to his opponent at the start, but Leo counterattacked with "Power Tool Dragon", his ace card. Devack then Summoned the Dark Synchro Monster, "Zeman the Ape King". Eventually, Leo was able to destroy his Dark Synchro Monster, at the exact same time that Regulus destroyed Zeman in the Spirit World, by utilizing his "Power Tool Dragon". However Devack summoned his true ace card, "Earthbound Immortal Cusillu". He attacked directly, but Leo prevented himself from being defeated. Then, Luna arrived, and took Leo's Duel Disk and the twins dueled together.

Demak Dust

Devack turning into dust

However, Devack Summoned "Ancient Fairy Dragon", and later sacrificed her to prevent the destruction of "Cusillu". This ultimately backfired for him, as Luna used Leo's "Respect Synchron" to Summon "Ancient Fairy" to her side and used its effect to destroy "Closed Forest" thus negating all the effects of "Cusillu" and rendered it useless. Then Luna assaulted it with "Power Tool Dragon", weakening it and then destroyed it with "Ancient Fairy Dragon". The duel ended with Devack's defeat.

Regretting his defeat, Devack turned into dust while asking Roman for forgiveness for failing the Dark Signers. (In the English version, he tried to drag Leo and Luna with him to the Netherworld, but failed when Yusei came in and saved them).


Devack upon returning alive

Devack was the first Dark Signer to be defeated.

When Rex was defeated in the final battle, and the King of the Netherworld was destroyed, Devack was restored to life, along with the other Dark Signers except for Roman and Rex himself. It was currently unknown if he kept the memories of his time as a Dark Signer. It was presumed that he returned to his old life before he died.


  • Devack was the only Dark Signer whose death and transformation into a Dark Signer was never explored.
  • According to the Yu-Gi-Oh! 10th Anniversary Animation Book, Devack was originally intended to be from a demonic worshipping cult and was sacrificed for their God's, but was reborn as a Dark Signer.

Non-canon appearances

Yu-Gi-Oh! 5D's Tag Force 4

In Yu-Gi-Oh! 5D's Tag Force 4 Devack appeared as a Partner character and could only be found at nightfall after completing Luna's story.

Devack's Story

Devack - End of Oppression

Devack in his pic for Tag Force 4 "End of Oppression?".

Devack arrived at the Player's house and asked him to fight alongside him to which he agreed.

Unlike other tag duels, Devack preferred to duel solo, so it may be a good idea to edit his deck beforehand.

In the first event, Devack solo dueled against Leo and mistook him for Luna.

In the second event, Devack solo dueled against Mina Simington and mistook her for Akiza Izinski.

In the third event, Devack solo dueled against Tetsu Trudge and mistook him for Jack Atlas.

In the final event, Devack solo dueled against Crow Hogan and mistook him for Yusei Fudo.

In the end, the so called Signers were defeated, and the player was disturbed.

Upon completing the story, the Player received three copies of Devack's signature card, Earthbound Immortal Cusillu and his photo "Devack - End of Oppression?"

Other appearances

In the final event of Yusei's story, Devack dueled with Roman against the Player and Yusei.

In the final event of Luna's story, Devack dueled with Michael against the Player and Luna.

In the first event of Shadow Drone Trudge's story, in an odd twist of fate, Devack and Luna dueled against the Player and SD Trudge.

Yu-Gi-Oh! 5D's Duel Transer

In Yu-Gi-Oh! 5D's Duel Transer, Devack was found on the fourth floor of Bifrost if you have a card "Earthbound Immortal Cusillu; he appeared without his cloak. Beating him unlocked his Deck Recipe at the card shop and enabled the player to continue Dueling him in Free Duels.


Devack played an "Ape"-themed Beast Deck. His "Earthbound Immortal" card was "Cusillu".


  1. Yu-Gi-Oh! 5D's episode 51: "A Whale of a Ride, Part 1"
  2. Yu-Gi-Oh! 5D's episode 50: "Mark of the Monkey, Part 4"


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