The world isn't what it once was.  Giant crystals hang in the sky over what's left of cities around the earth.  Electronic devices of human manufacture were once rendered inoperable by emissions by those hovering crystals and all subsequent attempts to revive such technology has failed, returning humanity to a pre-industrial existence.  Humans, once the most populace species on the planet, now struggle to pull back from the brink of extinction with a population barely 1/1000th of its pre-Invasio …