Alien invaders conquered the entire human population, except for runaway scientists searching for a rumored artifact. Earth''s leadership ignored an archeologist''s wild theory about a prehistoric superweapon.


    Dr. Sarah Watson, a believer, led her team deep underground. They discovered ancient ruins with an inscription, interpreted as:


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    "Here within lies the design for the superweapon. Use it once. Use it wisely. It wields the invader''s technology—it shall trigger a celestial event to stop them but will also destroy all of your histories—a climatic cataclysm across the planet. Prepare yourselves for a new beginning. We''ve used it once before ..."