Bahamut is an excedingly powerful force to be reckoned with but his true power is that no other dragon can defy his commands or lie to him. He also has the power to fuse with any other dragon into beings of impossible power.
Ragnarok-The Left Hand of Kronos;Breaker of Seals;Herald of Tyranus
Ragnarok was created by Kronos to destroy almost anything, even seals and oaths made by the Gods. Sort of a failsafe to the word of a god. However when he sided with Tyranus in the rebellion against Kronos he became the most powerful Wraith dragon. Bahamut defeated Ragnarok in the great war and split the evil dragons heart in four pieces. It is said if the 4 pieces were ever joined Ragnarok would be reborn and break the seal which holds his dark master.
Ethos-The Grand Chimera;Seal of the Nameless One
Ethos is one of the most powerful Wraith Dragons and one of the oddest. Looking nothing like a dragon most of the time, Ethos is a shifting mesh of beast that mold to suit almost any task. Backing this unique versatility is a near unrivaled strength which easily makes Ethos one of the most powerful dragons in existance. Currently, however, Ethos is bound to a single and incredibley important task of sealing away the Nameless One.
Sol-The Dragon of the Sun
The most powerful dragon(energy wise) in existance. Along with having a ridiculously abundant amount of energy Sol also has an amazing degree of control.