The Cage Breaker

This is an age of the future. The years before the twenty-first century's Third World War are known as the Early Ancient Era; the period after the Fourth World War as the Early Modern Era. Only after a breakthrough in physics does the Modern Era begin. Civilizations, nations, and societies are now devoting their strength to manipulating spacetime and other planes of existence.

Earth, the primary world, is the only true realm among the myriad spacetimes. Once technology breaches the crystal wall, Earth's mad dogs begin to gaze out across the multiverse.