The greatest calamity the universe had ever suffered was one that left it in shambles. It was a catastrophe so devastating that it required all the ancient lords to unite against it, and even then, most of them died in the process.
Known as the greatest catastrophe of any era, the appearance of the Abyss ruined most of the known universe. Despite its impact, no one knew the origins of the Abyss, which had simply appeared one day, like a wild beast intent on devouring everything.
The scenes the Time Lord saw in the memories finally gave him the answer he had long sought. The Abyss, which he had sealed with the help of other Ancient Lords, was none other than the Aether, having somehow gained sentience.
The Aether had always been within their reach, yet they had searched for it everywhere. Moreover the calamity that they suffered through, was one of their own making.