The greatest work of the prior worlds: The Engine of the Gods!

Few who dwell in the Ninth World know of the greatest achievement of the ancients, for it rests—imperceptibly, despite its vast size—on the very edge of the sun itself. The prior worlds were mighty beyond conception, but even for them, this Engine is a work of staggering proportion. What incredible threat to the sun, our world, and all the bodies of our solar system compelled them to such an audacious feat? Has that threat been ended?