666 (Trihexa)

666 (Trihexa) is a legendary being known as the Apocalyptic Beast and is stated to be a being that is on par with Great Red. It is the Beast recorded in the Apocalypse.

History
At some point in the past, the God from the Bible confirmed the existence of 666 that was thought to be unknown and placed thousands of seals on 666, sealing it at the "end of the world". In Volume 16, it was however revealed that Rizevim and Qlippoth found 666 by using the Sephiroth Graal's ability to come in contact with the principle of life and death and decided to unseal him with the power of the Holy Relics.

The Legend of Oppai Dragon and his Lively Companions
666 was mentioned in Volume 16 by Rizevim Livan Lucifer who reveals his goal to unseal Trihexa with the use of Sephiroth Graal and Incinerate Anthem to pit him against Great Red.

Power & Abilities
Immense Strength and Power: While 666's powers are unknown at this point, due to his sealing, it is noted he is a being with power on par with Great Red. It was so powerful that the mention of it was enough to provoke all mythological factions into allying together to confront the threat of a group trying to release it, and it took thousands of seals for the God of the Bible to seal it away. A clash between him and Great Red is feared simply because of the immense amount of damage that would inevitably be inflicted upon the world. It was stated by Azazel that their clash would mean the end of the world.