Neltharion

Deathwing the Destroyer, formerly known as Neltharion the Earth-Warder was one of the five Dragon Aspects and leader of the black dragonflight. Ages ago, Neltharion was empowered by the Pantheon with dominion over the earth and the deep places of Azeroth. However, driven mad by the Old Gods, he turned against the other Aspects during the War of the Ancients, eventually abandoning his title of Aspect of Earth in favor of being the Aspect of Death. Becoming one of the greatest terrors of the known world, his name too became one whispered with a feeling of fear and contempt among both mortals and dragons. He was perhaps the most powerful servant of the Old Gods. Deathwing also managed to turn his greatest enemy, Alexstrasza, into a slave of the Horde, with which he later allied himself. After a series of setbacks culminating in his defeat at the hands of the other Aspects, Deathwing retreated to Deepholm in the Elemental Plane to recuperate. From the depths of the earth, deeper beneath Grim Batol, he observed his former mate Sintharia's experiments with the twilight dragonflight and later continued his late consort's work. Though believed dead by many, Deathwing returned in spectacular fashion after the fall of the Lich King. Entering Azeroth through Deepholm fractured the World Pillar, causing the Elemental Plane to start collapsing onto Azeroth. This Cataclysm reshaped the entire world of Azeroth and unleashed widespread destruction. As the world reeled, he appeared and brought flame to various regions of Azeroth. His ultimate goal was to bring about the Hour of Twilight - the liberation of the Old Gods and the end of all life on the planet. Deathwing was aided by powerful allies also minions of his masters, such as the warped ogre-mage Cho'gall and his Twilight's Hammer cult, the powerful Elemental Lords Al'Akir and Ragnaros, and the Neferset tol'vir of Uldum.