Originally Posted by Scarmaker
Well Scarmaker here is the answer to your question:
Old Gods
The Old Gods were malevolent deities who ruled Azeroth in the ancient past before they and their Elemental Lieutenants were defeated by the Titans.
History
Long ago, Azeroth was a primordial world filled with the hostile elemental servants of the Old Gods. When the Titans visited the world in their quest to bring order the universe, they fought first against the Old Gods' lieutenants, Ragnaros the Firelord, Therazane the Stonemother, Al'Akir the Windlord, and Neptulon the Tidehunter, then against the Old Gods themselves. Soon, the Titans defeated the Old Gods and set about the long process of forming the lands and seas of Azeroth.
Note: It is suspected that The Old Gods are partially based on the legends of the Great Old Ones and the Outer Gods, creations from the legend of Cthulhu written by H.P. Lovecraft.
The Five
The Master's Glaive contains a huge fossil, the remains of an Old God.Of the five initial Old Gods, one was slain; its remains can be seen at the Master's Glaive in Darkshore. Three of the Gods were imprisoned beneath the earth. The fifth God, C'Thun, was defeated in Silithus in a battle which also resulted in the defeat of a Titan. C'Thun was believed to have been permanently defeated, but reemerged as the driving force behind the Qiraji.
The Three
The three Gods imprisoned beneath the earth continued to exert their will, though in limited ways.
They corrupted the great benevolent Dragon Aspect Neltharion, to create for them the extremely powerful Demon Soul, which they were to have Sargeras use to unintentionally set them free. The Demon Soul was taken from Neltharion by Malfurion, then taken from him by Illidan and put in the Sargeras-summoning matrix, then taken back from ther by Neltharion, who shortly thereafter was struck away by the Old Gods, who wished to have the summoning completed. Malfurion picked up the Demon Soul after Neltharion dropped it, and used it (in conjunction with Illidan) to prevent Sargeras' entry. It was then given to the dragons, stolen by Nekros ten-thousand years later, taken back by the dragons, and then destroyed.
They corrupted some of the Highborne of the Night Elves, and used them to lure the Burning Legion to Azeroth. Many of the Highborne were transformed into the Naga, who serve the Old Gods still.
They invaded Nozdormu's realm and managed to open a rift in time, that, as they had planned, tossed some beings back through time, beings that would change the way the war of the ancients took place, and give Sargeras a new chance to enter the world, and therefore them a new chance to set themselves free. Their plans were although again crushed by the very same Malfurion Stormrage.
C'Thun
C'Thun's physical formC'Thun is the only one of the Old Gods to be named so far, having receieved that name from his servants, the Qiraji. He is trapped deep beneath the ruined temples of Ahn'Qiraj, where he has exerted his will for thousands of years over the Qiraji, who in turn command the Silithid.
C'Thun is the final boss in the Temple of Ahn'Qiraj. Players will get to kill him, and doing so was the most difficult thing to do in the game until the Naxxramas instance was made available.
The Dead One
One of the Old Gods was killed by the Titans. Its remains can be found in Darkshore.
The Number of Old Gods Imprisoned
There are various sources as to the number of Old Gods imprisoned:
The Warcraft III manual states that five Old Gods were chained beneath the world.
According to the War of the Ancients Trilogy, there are three Old Gods still living, imprisoned and chained by the Titans deep beneath the surface of Azeroth.
According to The Old Gods and the Ordering of Azeroth, four Old Gods were imprisoned beneath the world. This could perhaps be reconciled with the War of the Ancients Trilogy if it were taken to include the fallen C'Thun in the count of the imprisoned Gods.
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Ragnaros
Ragnaros the Firelord
Gender Male
Race Elemental
Character class Not Applicable
Affiliation Old Gods
Occupation Firelord
Status Slumbering within Molten Core
Relatives Several elemental offspring
The Fire god and his brethren once held sway over the entire world. As a servant of the Old Gods, he fought against the Titans for domination over the planet. The victorious Titans banished him and his brethren to the Elemental Plane - there to remain imprisoned until the end of time.
It was then and there that the brothers turned on each other. For five millennia a battle was fought at the core of this world.
It was during the Elemental Sundering that Ragnaros sought to consume Thunderaan, Prince of Air. Thunderaan fell, utterly defeated. The Firelord feasted upon the essence of Thunderaan, but was unable to consume him entirely.
In the center of a vast lake of fire in the Elemental Plane stands Sulfuron Keep, the home of Ragnaros. Until comparatively recently, he ruled his underground land with a molten iron fist.
Three hundred years ago, the ambitious and ruthless Dark Iron Clan initiated a war against their dwarven brethren, the Bronzebeard Clan and Wildhammer Clan. During this War of the Three Hammers, the Dark Iron Dwarf leader named Thaurissan lay siege to the Wildhammers' capital city of Grim Batol, destroying it. Despite this victory, the united Wildhammers and Bronzebeards were ultimately able to push the Dark Iron dwarves back to Blackrock Mountain. Thaurissan, seeking to summon a supernatural minion that would turn the tide of the war back to his favor, called upon the ancient powers sleeping beneath the world. To Thaurissan's surprise, and ultimately his doom, the creature that emerged was more terrible than any nightmare he could have imagined.
Now, freed by Thaurissan's call, Ragnaros erupted into being once again. Ragnaros' apocalyptic rebirth into Azeroth shattered the Blackrock Mountain and created a raging volcano at the center of the devastation. The volcano, known as Blackrock Spire, was bordered by what is now known as the Searing Gorge, to the north, and the Burning Steppes, to the south. Though Thaurissan was killed by the forces he had unleashed, his surviving Dark Iron Clan brethren were ultimately enslaved by Ragnaros and his elementals. Many Dark Iron dwarves remain within the lower areas of the mountain, especially Blackrock Depths, toiling away at the behest of Ragnaros and the Firelord's lieutenants. The Bronzebeards and Wildhammers, however, remain free.
Witnessing the horrific devastation and the fires spreading across the southern mountains, the Bronzebeards' King Madoran and Wildhammers' King Khardros halted their armies and hastily turned back towards their kingdoms, unwilling to face the awesome wrath of Ragnaros.
Now he lies at the bottom of that volcano on Azeroth, striving to find a way home, as well as to gather his strength once again so he can burn away Azeroth and take it for his own. Meanwhile, in Sulfuron Keep and elsewhere across the Firelands, his elemental princes battle constantly for dominance.
He and his dwarven minions took control of the Blackrock mountain's volcanic depths and made war on the orcs in the Upper Blackrock Spire, which served as the seat of power for Nefarian the Black Dragon. Ragnaros has uncovered the secret to creating life from stone and plans to build an army of unstoppable golems to aid him in conquering the whole of Blackrock Mountain.
Etymology/inspiration
Ragnaros' name is from Ragnarök(Ragnarok), the end of the world in Norse mythology, but he seems to be based on the leader of the Fire giants, Surt. This battle would be fought between the gods (the Æsir and the Vanir), and the jotuns (the giants): the hrímþursar (frost giants) and the eldjotnar (fire giants, led by Surtr), together with Loki and his children.
Quotes
Ragnaros Summoning talk:
Majordomo Executus: Behold Ragnaros, the Firelord! He who was ancient when this world was young! Bow before him, mortals! Bow before your ending!
Ragnaros: TOO SOON! YOU HAVE AWAKENED ME TOO SOON, EXECUTUS! WHAT IS THE MEANING OF THIS INTRUSION?
Majordomo Executus: These mortal infidels, my lord! They have invaded your sanctum, and seek to steal your secrets!
Ragnaros: FOOL! YOU ALLOWED THESE INSECTS TO RUN RAMPANT THROUGH THE HALLOWED CORE, AND NOW YOU LEAD THEM TO MY VERY LAIR? YOU HAVE FAILED ME, EXECUTUS! JUSTICE SHALL BE MET, INDEED!
Ragnaros: NOW FOR YOU, INSECTS. BOLDY YOU SOUGHT THE POWER OF RAGNAROS! NOW YOU SHALL SEE IT FIRSTHAND!
DIE, INSECT! (When he kills the player he has aggro on)
BY FIRE BE PURGED! (Ranged knockback)
TASTE THE FLAMES OF SULFURON! (Melee knockback)
COME FORTH, MY SERVANTS! DEFEND YOUR MASTER! (Summoning Sons of Flame)