Devack

Demak is one of the Dark Signers. He wears the black robes of the Dark Signers accented with gold stripes. He has great hatred towards the Signers. His dark mark is the monkey. He also happens to know Krieger.

When the powers of the Dark Signers, Misty Lola and Carly Nagisa manifest simultaneous their Earthbound Gods' lines are etched out around the Arcadia Movement building. A Security wagon transporting Krieger is within the lines. After "Earthbound God - Ccarayhua" is Summoned, Demak appears and frees Krieger from their custody, displaying apparent superhuman strength (enough to break Krieger's handcuffs with a game card). He appears to have some connection to Krieger despite Krieger not knowing him, possibly being a survivor of Krieger's village's destruction that simply had never met Krieger.

The only card revealed from his Deck is "Axe of Despair", the card used to break Krieger's handcuffs.