Herobrine was born into a wealthy family on Indev, a planet in the same star system as Earth. As an Indevian, he stopped aging at age 75, a relatively young age for most Indevians. He was brothers with Notch, and they helped one another to prosper on Indev. They both showed great military talent, especially Herobrine, and Herobrine enlisted as a soldier at age 40 (18 in comparison to human development).
He rose through the ranks quickly, and the Indev Institute of Space Exploration soon recognized his great wisdom and strength. At age 70 (human age 28), he was accepted as the head colonel to Space Admiral Sparklez, and at age 85, he was assigned the position of first officer of the Cronus IX, the first large interplanetary spacecraft. He convinced the Institute to accept Notch, at the time a captian in an Indevian army, as first lieutenant onboard the Cronus IX.
Although Herobrine secured for Notch an honorable and historical position, Notch held a personal grudge against Admiral Sparklez (reason for this still unknown) and several weeks into the Cronus IX's voyage, Notch began to plan a mutiny with his associates Jeb and Dinnerbone. The mutiny failed when Notch attempted to get Herobrine to join him in his mutiny, as Herobrine refused and alerted Sparklez to their plot. Notch and his friends were marooned on Earth, where they became Protectors of Earth.
When Herobrine returned to Indev, he found his nation (name lost to time) at war with another. The Institute sided with Herobrine's nation and allowed it to use spacecraft to drop nuclear warheads over the enemy nation. In retaliation, the air force of the enemy nation launched nuclear missiles at Herobrine's nation, and the entire planet of Indev eventually lost its thin crust and its burning core was exposed, destroying what little was not destroyed by nuclear warfare.
Herobrine and a handful of his survived this war in a bunker and with superior technology which allowed him to live on the molten Indev. All other surviving creatures were grotesquely mutated by fallout from the nuclear wars. It was in this deplorable state that Herobrine lived for millions of years.
It came to be, over millions of years, that Indev developed a trajectory that caused it to collide with Earth. During this collision, Herobrine saw spacecraft launching off of Earth to escape destruction, and Herobrine knew that Notch had survived. This, along with his years on molten Indev, twisted his mind and caused him to become Evil. Herobrine came to seek the death of all Overworld creatures after this collision, devoting all his resources towards destruction of everything Notch held dear.
Herobrine spent most of his time in the Netherworld until he became aware that Notch had granted humans intelligence, and that they may eventually become capable of destroying his Nether kingdom. Herobrine put his mind to work and decided to use human intelligence to his advantage. He disguised himself as a human and began to corrupt the minds of kings, aristocrats, peasants, and anyone else he could find. He introduced them to trickery, selfishness, and war. And although humans continued to progress, they became hateful and self-destructive.
The Great War
This has been redirected to 'the Great War for the sake of conservation of time. A summarized account of the Great War MAY be developed in the far future.