Once upon a time, godlike creatures of order called Titans landed on a small, unassuming planet named Azeroth and proceeded to reorganize it. After they left, the planet was invaded by malevolent creatures called Old Gods -- creatures of chaos and destruction. The Titans returned to the little planet, horrified at what had happened, and rose up against the Old Gods and their elemental lieutenants in what was the most horrific war the planet had ever seen. But instead of destroying the Old Gods, the Titans were forced to imprison them deep within the planet.
They set safeguards over the fragile world -- draconic aspects to watch over the various domains of life, the earth, magic, time, and nature. They created new guardians to watch over the prisons of the Old Gods. They created a magical font of energy, tied to the Twisting Nether -- the Well of Eternity. And satisfied with their work, the Titans left. No one on the fragile planet has seen them since; they are spoken of in history and in legend, but they've never returned.
Why? Of all the questions in Azeroth, this is the biggest by far. Why did the Titans imprison the Old Gods, instead of starting over from scratch? Common theory suggests they liked the planet too much to re-originate it, yet they left behind safeguards that would do exactly that, if the Old Gods escaped again. So why not simply do so to begin with? Why leave the world as it stood? More importantly -- why are we here?
Today's Know Your Lore is a Tinfoil Hat edition, meaning the following is a look into what has gone before with pure speculation on why it happened. The events presented are events that happened in Azeroth's history, but the conclusion is simply a theory and shouldn't be taken as fact.