The dark bahamut dragon is one of two breeds of balance dragons. The other breed  are light demon dragons. Dark bahamut dragons are also known as midnight lethal dragons, except midnight lethals are dark bahamut dragons in normal mode, and dark bahamut dragons are in the victory mode. This was discovered when Nexus was in battle and changed form from a four legged beast to a humanoid beast standing on two legs with arms and his glowing  purple-blue patterns and eyes changed to a luminous color that was changing to all couloirs in an endless loop. So they basically look like a black awakened bahamut but with rainbow patterns. They are both the same species. Dark bahamut dragons are known for their power and victory against even the strongest of fatal valeries! They can continuously change from normal mode to victory mode.

Since they are the same species as midnight lethals, their natural enemies are fatal valeries and hypnogons, but the three species team up to defeat a constant growing threat, lava dragons and their king that is a one of a kind giant soul lava dragon (A lava dragon that is massive and has blue lava instead of orange. It has a crown made of fire resistant gold). 

Their attack method is to either launch lightning from its mouth or fists or punch their foe or bite with paralysing poison, killer venom acid, extreme bite force and shocking lightning. Their claws are so sharp it can cut through one hundred meters of tungsten like a hot knife through one millimetre of butter. It can choke foes with its long tail. It can fly up to one million times the speed of light.