Changes

| anime_deck = [[Ape]]/Beast

'''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 [[Duel Monsters Spirit World#Yu-Gi-Oh! 5D's|Spirit World]] with the help of his subordinate, [[Zeman the Ape King (character)|Zeman The Ape King]].  ==Design=====Appearance===Devack wears the black robes of the [[Dark Signers]] that were accented with yellow stripes. His [[dark mark]] is the monkey.

[[File:Demaklineart.png|thumb|left|LineworkLineart.]]Devack had great loyalty to the [[Dark Signers ]] and for to [[Roman Goodwin|Roman ]] in particular. His final words as he dissolved, he apologized were an apology to Roman for losing.<ref name="ep51">{{episode|Yu-Gi-Oh! 5D's|51|ref}}</ref> He also looked down on those who were not [[Signer]]s, and enjoyed the pain of others, as seen when he tried to show [[Luna]] more sadness by using "[[Ancient Fairy Dragon (anime)|Ancient Fairy Dragon]]" against her.<ref name="ep50">{{episode|Yu-Gi-Oh! 5D's|50|ref}}</ref>

It is unknown how Devack died and how he became a [[Dark Signers|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 Goodwin|Roman]] and the other Dark Signers, and pledged his loyalty to Roman. At some point, he was given [[Ancient Fairy Dragon (anime)|Ancient Fairy Dragon]] by Roman, and more than likely to set up a his eventual confrontation with [[Luna]]. He appeared out of the original [[Ener-D]] Reactor by arriving by helicopter in order to free [[Greiger ]] from custodywith an "[[Axe of Despair (anime)|Axe of Despair]]" card, as his transport guard's souls had been absorbed by the "[[Earthbound Immortal Ccarayhua(anime)|Earthbound Immortal Ccaryahua]]". Devack then invited him to join them and get revenge on [[Rex Goodwin]] for the destruction of his home townhometown. They later picked up [[Misty Tredwell]] and [[Carly Carmine]] from the destroyed [[Arcadia Movement building]] 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.

He finally showed himself to his rivals, the Signers, after Roman's [[Shadow Duel]] against [[Yusei Fudo|Yusei]] concluded. Before their departure, he showed [[Luna]] that he possessed her the "[[Ancient Fairy Dragon]Drago]" 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 [[Tetsu Trudge|Trudge]] to where Devack was, she instead went into the [[Duel Monsters Spirit World]] in order to free [[Ancient Fairy Dragon (character)|Ancient Fairy Dragon]] from her imprisonment with the the help of her servant, [[Regulus (character)|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 Duel was still on. Devack was quickly able to inflict damage to his opponent at the start, but Leo counterattacked with "[[Power Tool Dragon (anime)|Power Tool Dragon]]", his ace card. Devack then Summoned the [[Dark Synchro Monster]], "[[Zeman the Ape King (anime)|Zeman the Ape King]]". Eventually, Leo was able to destroy his Dark Synchro Monster, at the exact same time that Regulus destroyed [[Zeman the Ape King (character)|Zeman ]] in the Spirit World, by utilizing his "Power Tool Dragon". However Devack summoned Summoned his true ace card, "[[Earthbound Immortal Cusillu (anime)|Earthbound Immortal Cusillu]]". He attacked [[Direct attack|directly]], but Leo prevented himself from being defeated. Then, Luna arrived, and took Leo's [[Duel Disk]] and the twins dueled Dueled together.

[[File:Demak Dust.jpg|thumb|left|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 [[[card effect |effect]] to [[destroy ]] "[[Closed Forest (anime)|Closed Forest]]" thus [[negate|negating]] all the effects of "Cusillu" and rendered rendering it useless. Then Luna assaulted it with "Power Tool Dragon", weakening it and then destroyed it with "Ancient Fairy Dragon". The duel Duel ended with Devack's defeat.

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

 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 is 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 Signers|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 of demon worshippers. He was sacrificed for their Godto the cult's, but was Gods and reborn as a [[Dark Signer]].

{{Main|Devack (Tag Force)}}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====[[File:Devack_-_End_of_Oppression.png|thumb|Devack in his pic for Tag Force 4 "End of Oppression?".]]Devack arrived at the [[Player Luna (Tag Force)|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 [[Kentaro Miyazaki|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.

In ''[[Yu-Gi-Oh! 5D's Duel Transer]]'', Devack was found on the fourth floor of Bifrost if . If you have a card "[[Earthbound Immortal Cusillu]]; , he appeared appears 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 "[[Earthbound Immortal Cusillu(anime)|Cusillu]]".