The Metalwood Saga / Reference Guide

Full-series spoilers

Ascension

The Ascension was the monumental and catastrophic event orchestrated by the Cothellon approximately three hundred years prior to the main story. Under the leadership of Lorelei, the Planners launched a massive fleet of seven levitating "sky cities" (including New San Francisco) high above Earth, cloaking them behind forcefields. This allowed the Cothellon to escape the ravaged surface of the Earth, abandoning the remaining human "Remnant" to survive the post-apocalyptic world below.