Nozdormu the Timeless One is the head of the Bronze Dragonflight chosen by the Titan Pantheon to watch over the World of Azeroth. He was empowered to police time itself, and so he became “Master of the spinning roads of fate” and known as the Timeless One. His Prime Consort is Saridormi.

Appears in the novelization Warcraft: Day of the Dragon
Appears in Warcraft: War of the Ancients trilogy
Appears in World of Warcraft*

An Archmage of Dalaran who dwelled in the Quel’Thalassian Capital of Silvermoon. When the Undead Scourge laid siege to the city, Arcanister resisted in every way possible. Seeing that the battle was ending and that his comrades were far outnumbered, Arcanister fled with a handful of survivors to Dalaran in order to warn the Kirin Tor. When Arthas and Kel’Thuzad made their inevitable journey to Dalaran, the Mages were more than ready for them. The Mages had constructed a shield-type spell that drained the evil energy of the Undead Scourge and for a time the Undead were unable to attack the city. However, this spell had to be maintained by 3 Archmages, and Arcanister was one of them. Arcanister guarded the Gates of Dalaran and maintained the shield and held off the Scourge for a brief period. However, the Undead used devious tactics to combat the Wizards and humans of Dalaran and Arthas was eventually able to kill the Archmage. The other 2 mages resisted for a period but were also murdered by the teeming Undead Armies. With their deaths came the loss of Dalaran. Arcanister was a prolific and benevolent Mage who is remembered as a hero of the Human Alliance.

Appears in Warcraft III: Reign of Chaos

Ner’zhul was the mentor of Gul’dan and a powerful Shaman who made a pact with (and was corrupted by) Kil’Jaeden. Due to his failure in establishing a grand invasion of Azeroth, and for opening various portals to other worlds, he was punished by encasing Ner’zhul in the Frozen Throne. He became the Lich King and was ordered to create the Scourge and lead a second invasion into Azeroth. He became too powerful for Kil’Jaeden to control. Arthas traveled to Northrend and shattered the frozen throne, donning the armor of Ner’zhul, and fused with him to become one of the most powerful beings the world has ever known.

Appears in Warcraft II: Beyond the Dark Portal
Appears in Warcraft III: The Frozen Throne
In World of Warcraft the Lich King is seen in Naxxramas talking to Kel’Thuzad

Neltharion the Earth Warder was one of the Five Dragon Aspects created to defend Kalimdor. After the creation of the Dragon Soul (soon after renamed “Demon Soul”) he betrayed the other Aspects, and became the dragon Deathwing. He is the sworn enemy to Alextrasza, the leader of the Red Dragons and Ysera, the Leader of the Green Dragons. For a while, he became the ally of Ner’zhul and offered his black dragonflight to serve him. He was in command of the Black Dragonflight until he disappeared. The remnants of the Black Dragonflight are lead by his heir, Nefarion.

In Warcraft II: Beyond the Dark Portal, Deathwing had armored plates fused to his already strong scales by goblin alchemists, making him even more resistant to damage.

Appears in Warcraft II: Beyond the Dark Portal
Appears in Warcraft: Day of the Dragon
Appears in Warcraft: War of the Ancients trilogy

After the Second War, the Dragonmaw Clan is not the same threat they were when they had dragons, but they’re still fierce opponents. The Dragonmaws are now led by Chieftain Nek’rosh, son of Nekros Skullcrusher, who was one of the top liutenants of the Dragonmaws years ago. Nekros used powerful magic to tame the Red Dragons, but when that magic failed him, Nekros was killed by the dragons and his son has vowed revenge against the dragons who slew his father. The dragons were not very happy with their old masters, and fiercely hunted the Dragonmaws. What few remained fled from Grim Batol and into the Mountains east of Whelgar’s Excavation. Now they’ve gained strength, and have an encampment northeast of Menethil. Nek’rosh has built catapults and aims to lay siege to Menethil. And with the fighting in Dun Algaz, they would be effectively blocked from reinforcements.