Dragon

Dragons are extremely powerful and intelligent creatures that live in Earth Land.

History
More than 400 years ago, Dragons were the rulers of the land and humans were considered to be merely a food source for them. One day, a Dragon proposed a truce between them, believing both species could live in harmony. This soon led to a civil war between both factions: the pro-humans and their opposite. Eventually, some humans were taught Magic by the Dragons and were requested to join the war. Before long, the tide of the war shifted into the favor of the pro-coexistence faction. However, both sides overlooked a potential threat: the humans who were taught Magic by the Dragons. Many a Dragon were slain, and thus, the humans became known as Dragon Slayers. In one case, a Dragon Slayer killed many Dragons, both friend and foe alike, and bathed in their blood, and turned into a Dragon himself: the reputed Black Dragon and self-proclaimed Dragon King, Acnologia. All other facts and stories about Dragons were collected in one book: Dragon Historia. One story in said book recounts the tale of Acnologia, and his single-handed destruction of an entire country.

At some point 400 years ago, remaining Dragons formed the Magna Carta with humanity, agreeing to watch over them as they create the future.

July 7, X777
On July 7, X777, all the remaining Dragons, except Acnologia, seemingly vanished, most notably, Igneel, Metalicana, and Grandeeney, who each abandoned their young foster children, leaving the species to be remembered as little more than a myth. However, this was revealed, as per the word of Igneel, to have been due to the Dragon parents of the young Dragon Slayers not wanting them to eventually turn into Dragons like Acnologia had done. In order to prevent this, they hid inside the bodies of their foster children via a secret art, which allowed them to create antibodies to prevent this "Dragonification". They also did this to extend their own lifespan, having been left in a half-dead state after their souls were taken by Acnologia's Dragon Slayer Magic.