Oh,so the end of days is the Second Hyperspace War?
Yup. That conflict is the death knell of all Galactic Civilization. The actual annihilation is dragged out over 21 years with the final deathblow being delivered by Jericho's Pyrrhic victory against the Beast during the War in Heaven itself.
Akira "Paradox" Robinson claims to be trying to prevent Jericho's Pyrrhic victory and make the War in Heaven have a definitive outcome in favor of the Stormbreakers. According to her theory, this will prevent spacefaring civilization from dying out after the 2HW ends.