They are malignant entities, forces of chaos and destruction that were locked beneath Azeroth long, long before most of the sentient races we know today came to be. The Old Gods, horrific creatures capable of warping mind and thought, bending "lesser creatures" to their whim, once reigned supreme on Azeroth until they fell to the Titans. Yet they persisted still, even from within their prisons deep beneath the soil. C'thun, Yogg-Saron, N'zoth, and even the haunted last breaths of the Old God Y'Shaarj have presented a persistent menace that simply will not go away.
And according to at least some accounts told in Titan records, it's because they can't go away. They can't be killed. Destroying the Old Gods would result in the destruction of Azeroth itself, which is why the Titans chose to merely imprison them instead of flat-out destroy. But one question lingers, in the midst of all the this muddled history. Who -- or perhaps more appropriately, what -- are the Old Gods? Where did they come from? Which version of their history is correct ... or is the truth simply sitting somewhere in between the two?
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 how it happened. These speculations are merely theories and shouldn't be taken as fact or official lore.