The Lost Ages is a theorized period of history that came before the Dawn Era. On theory is that a long period of history, many ages, once existed, and then all that was consumed by Chaos. Some belief that all that has come since the Dawn Era will eventually return to being the flotsam of this Sea of Entropy.
Stuff of high technology, or even something that cannot be pinned on anyone, like the spider-constructs known as the Clockwork Horrors, spells like the Wind of Duplicity, the Birthing Ponds of the Crillion Comet, the Heart of Eden, the Hollow of Tarsilja, and entities like the Third Instructor, are thought to be things out of the Lost Ages.
The Dawn Era