The Seventh Egg is the Egg of Destruction

The emergence of a new Cosmic Egg portends annihilation for the existing cosmos because for the next cosmos to be born, the current one has to die. That is, unless Klearvius Kern, a self-taught student of both Alchemy and Magic, can find a way to transmute the Cosmic Egg into something harmless, as his six fabled predecessors were said to have done.

Aiding him in this quest are the Twin Demons of the Outer Darkness, whom he summons to shake up the existing order on the planet named Estrildis, and spare it its untimely fate.

However, doing so has consequences. Their names are Aneldon, Arrandra, Damallon, Jeon, Sirideo, Helethria, and Zelnia. When Klearvius sets his plan in motion, these seven find their dormant abilities awakening, and they begin running amok. They may even pose a greater danger to Estrildis than the Cosmic Egg itself.