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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, is one of the Dark Signers. He wears the black robes of the Dark Signers accented with yellow stripes and his dark mark is the monkey. He frees Greiger from his prison transport, offering him the chance to fulfill his desire for vengeance. He is also responsible for the Minus Curse that infects the Spirit World with the help of his subordinate, Zeman The Ape King.


Devack has great loyalty to the Dark Signers, as seen by his final words as he dissolves "Glory to the Dark Signers!".[1] He also looks down on those who are not Signers, and enjoys the pain of others, as seen when he tried to show Luna more sadness by using "Ancient Fairy Dragon" against her.[2]


Devack lineart


It is unknown why Devack joined the Dark Signers, though he appears to have been one of the earlier members. He first appears out of the original Ener-D Reactor arriving by helicopter to free Greiger from custody, as his transport guard's souls have been absorbed by "Earthbound Immortal Ccarayhua". Roman then invites him to join them and get revenge on Rex Goodwin for the destruction of his home town. They later pick up Misty Tredwell and Carly Carmine to return to the Ener-D reactor.

He finally shows himself to his rivals, the Signers, after Roman's Shadow Duel against Yusei concludes. The battle between them and their rivals as their final battle is about to commence.

Before their departure he shows Luna that he possesses 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 is 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 are taken by Trudge to where Devack is, she has instead gone 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 finds the control unit, Devack approaches him while the Monkey geoglyph materializes. Leo then bravely challenges him, stating that if he defeats the Dark Signer then Luna won't have to Duel.

Despite Devack's warning that Leo won't be able to save himself and his sister, as he is not a Signer, the duel is still set on. Devack is quickly able to inflict damage to his opponent at the start, but Leo counterattacks with "Power Tool Dragon", his ace card. Devack then Summons the Dark Synchro Monster, "Zeman the Ape King". Eventually, Leo is able to destroy his Dark Synchro Monster, at the exact same time Regulus destroys Zeman in the spirit world, by utilizing his "Power Tool Dragon". However Devack summons his true ace card, "Earthbound Immortal Cusillu". He attacks directly, but Leo prevents himself from being defeated. Then, Luna arrives, takes Leo's Duel Disk and the twins duel together.

Demak Dust

Devack turning into dust

However, Devack Summons "Ancient Fairy Dragon", and later sacrifices her to prevent the destruction of "Cusillu". This ultimately backfires for him, as Luna uses Leo's "Respect Synchron" to Summon "Ancient Fairy" to her side and uses its effect to destroy "Closed Forest" thus negating all the effects of "Cusillu" and rendering it useless. Then Luna assaults it with "Power Tool Dragon", weakening it and destroys it with "Ancient Fairy Dragon". The duel later ends with Devack's defeat.

Regretting his defeat, Devack turns 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 is the first Dark Signer to be defeated.

When Rex is defeated in the final battle, and the King of the Netherworld is destroyed, Devack is restored to life, along with the other Dark Signers except for Roman and Rex himself. It is currently unknown whether he will have memories of his time as a Dark Signer. At this point, it's presumed he returned to his old life, before dying.

Despite the others, Devack is the only Dark Signer whose character and transformation into a Dark Signer was never explored. He is also the only one who was not shown repenting for his crimes as a Dark Signer. Furthermore, 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. It is unknown why they decided not to explore this in the anime.

Non-canon appearances

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

In Yu-Gi-Oh! 5D's Tag Force 4 Devack appears as a Partner character and can 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 arrives at the Player's house and asks him to fight alongside him to which he agrees.

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

In the first event Devack solo duels against Leo mistaking him for Luna.

In the second event, Devack solo duels against Mina Simington mistaking her for Akiza Izinski.

In the third event, Devack solo duels against Tetsu Trudge mistaking him for Jack Atlas.

In the final event, Devack solo duels against Crow Hogan mistaking him for Yusei Fudo.

In the end the so called Signers are defeated and the player is disturbed.

Upon completing the story, the Player will receive 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 duels with Roman against the Player and Yusei.

In the final event of Luna's story Devack duels 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 duel against the Player and SD Trudge.

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

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


Devack plays an "Ape"-themed Beast Deck. His "Earthbound Immortal" card is "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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