War stars

Wrath of the Chaos Sun
"In the Maxil Beta System, a red giant star explodes in a warp-tainted supernova. All those touched by its dark Chaos energies are mutated, possessed or destroyed outright. The Imperium mobilises every military asset within fifty light-years of the event, sending them straight to war. The resultant disaster is eventually contained at the cost of uncounted billions of lives."