The world was completely destroyed and humanity was completely wiped out, leaving only one continent and one man. A man whose very being began to shift.
After the world succumbed to destruction, the core of the earth was infected with a blight. Earth had begun an era of complete change, the blight infecting every last function of the world including the world's sole survivor.
And as the man's life began to extinguish, he ran, into a cave far away from the blight, far away from the changing world, where he would spend the last of his remaining life in a cave deep enough to slightly shield from the blight. The only remaining safe haven. The small remnants of blight began to morph his body, his cells, his DNA, his very being.
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Before his death, he inscribed the knowledge he had gained in that cave, onto a wall of the cave, and with that, humanity as we know it was gone.
Time passed, and as bacteria once again began evolving in the ocean, the blight infected it, completely changing the biological structure of all future life.

