Lord Azhna

Lord Azhna is the entity responsible for sending the Paladin Deathknight to extend a meeting invitation to Lady Vasarus, presumably not knowing that she was dead. The fact that he was in control of one of the Dragonborn deathknights, combined with the fact that he has a draconic-sounding name, strongly implies that he is a dragon.
Azhna also takes part in the Dragon Council unlisted story video on youtube. There he takes part in the Conventum Dominorum, and as he and some of the other oldest and most powerful leaders of the "Dragon continents" discuss strategy, Azhna sounds relatively patient and diplomatic. Most of the council foresee great threats they will have to deal with in the future, and Lord Azhna's plan is to contact and to reunite with the strongest Dragons elsewhere in the planes - those who have, for various reasons, gone off on their own and largely broken off contact with their brethren.
The dragons whom Lord Azhna is trying to reach include "the Sky-Dragons, the Deep One, Lord Hazkrakor", and one referred to by another Dragon Lord as "that golden freak" who is said to possess a vast intelligence network, and a great hoard including "artifacts of great power".