Ancient Flame Dragon

Ancient Flame Dragon (エインシャント・フレイム・ドラゴン) is one of the Three Rulers of Mt. Rappaslea. Particularly, it ruled the earth. Although its home is in Mt. Rappaslea, it seems like it regularly crosses through the Gates to the caverns of the Azerlisia Mountains.

Appearance
As the name suggests, it has the look of a fire dragon.

Personality
So far no information is given on it's personality, but given it's position as one of the Three Rulers of Mt. Rappaslea, it may be a territorial creature.

Background
The Ancient Flame Dragon seems to have apparent control over the earth.

The Craftsman of Dwarf Arc
This monster was briefly mentioned among one of the strongest monsters in the Azerlisia Mountains.

Abilities and Powers
Since it is a dragon, it should be capable of inducing fire breath attacks.

Trivia

 * Given that this dragon has the name Ancient, which categorize it a a being that has reached the highest age category amongst their kind, it's possible that this dragon could be close to a Dragon Lord.
 * In Mass for the Dead, a greedy gold-loving dragon was encountered, living deep in the caverns of the Azerlisia Mountains. This dragon could have been an indirect reference to the Ancient Flame Dragon in the Light Novels.