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Elder Coffin Dragon Lord  (エルダーコフィン・ドラゴンロード) is a Dragon Lord, the most powerful dragons in the New World.

Background
It is known that Elder Coffin Dragon Lord is currently dead. Shown by its epithet, Elder Coffin Dragon Lord was an Undead Dragon, the same as the Vampiric Dragon Lord.

The Lizard Man Heroes Arc
Zesshi Zetsumei guess that Shalltear to be either the Elder Coffin Dragon Lord or Vampiric Dragon Lord, as she was too strong to be classified as normal vampires of this world.

Trivia

 * There is a possibility that Elder Coffin Dragon Lord is still active, as it is undead.