Catastrophe Dragon Lord

Catastrophe Dragon Lord (カタストロフ・ドラゴンロード) is a Dragon Lord, and one of the most powerful dragons in the New World.

Background
It seems that Catastrophe Dragon Lord was already dead as the "Thousand Leagues Astrologer" of the Slane Theocracy predicted its revival.

The Undead King Arc
When the Catastrophe Dragon Lord was predicted to revive, the Slane Theocracy dispatched the Black Scripture, one of the Six Scriptures to deal with the situation.

The Ruler of Conspiracy Arc
According to the Cardinals, the threat of the Catastrophe Dragon Lord is still at large. With most of the Slane Theocracy's forces occupied and indisposed, the Cardinals hope to resolve the situation by using Downfall of Castle and Country on the said dragon, should it appear, and use it as a vanguard against the Sorcerer King.

Abilities and Powers
The Catastrophe Dragon Lord's power is unknown but it should be noted that the Archbishops sent all thirteen members of the Black Scripture to defeat the Dragon Lord, which speaks volumes of its power.