The Transcenders are robots built by Odin's tribe, five thousand years ago, together with the Yggdrasil Tower. They serve as Odin's personal army of robots for his own purposes.
According to Surtr, Transcenders can use any powerful Deck such as Greiger's Deck, and the only thing is missing in a Transcender is the Duelist's soul.
There are different versions of Trascenders present in the game. Two special Trascenders, one red and one blue, are named Freki and Geri, and they are apparently the strongest of all Trascenders. At some point of the game, Odin reveal that also Surtr himself is actually a Transcender, despite the fact that Surtr denies this.