Devack, known as Demak (ディマク, Dimaku) is an opponent in Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia. This is a video game depiction of Devack, a character from the Yu-Gi-Oh! 5D's anime.
Devack is first seen during the game's opening scenes, standing alongside Misty, Roman and Kalin in the Momentum Reactor.
During the final battle against the Dark Signers, the player and Luna face Devack together and defeat him.
After finishing the game, the player can duel against Devack as the first opponent of the dark misma duel gauntlet located in the Momentum Reactor.