For me, I'll treat it just as seriously as every other end of the world prediction, aka not at all. Why? Well a prediction from the same person who made a ton of often wrong predictions used to justify anything and an ancient civilisation aren't the greatest of reliable sources (why the heck do they even give seriousness to these mythical end of the world doomsday predictions by a culture that couldn't even predict their own demise or future?)
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