The Gutter Wars Begin
Metaphysical / Paranormal event
900Y
The undead rise in hordes. These hordes become an instant existential threat to the human race.
An extended triple eclipse occurs for more than a month, with the moons in perfect alignment with each other and the sun. The unconsecrated dead begin to rise in overwhelming numbers, prompting hasty barriers to be erected around every human settlement regardless of size. The Gutter Wars begin.