No longer content to inhabit one host at a time, the Grendel entity goes viral, in a new phase of Wagner's epic spanning centuries and culminating with the rise of a new kind of host-the Grendel-Khan! This volume collects the never-before-reprinted "Incubation Years" tales from Grendel #20-#22 and the mammoth God and the Devil and Devil's Reign story lines, featuring art by Tim Sale and John K. Snyder and collected in order for the first time!