King of the Netherworld

The ¨King of the Underworld¨ is the consequently ruler of what´s known as the Underworld.

Mentioned briefly by the Dark Signers leader, Rudger in his rematch against Yusei Fudo. For now not much is known about this character, only that the Dark Signer describes this unknown entity as the "Ultimate God" one said to be the mightiest of them all. Also that it appears to be already unleashed.

According to Rudger it shall appear soon, if the 4 controller Towers for the Old Momentum are not activated before sunset. As by then the Door to the Underworld will be finally be opened.

Mostly this has to do with the Old Momentum acting as the Door to the Underworld, which in order to be closed properly first its respective controllers must be sealed by each one of the 4 Signers.