gamehuntera
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Well, Armageddon wiped out almost all life, but the earth still remained (sort of). If the earth remained, then there are no problems – new life emerges every 10 million years ( :)), and with the help of magic, it happens even faster. And the old races survived outside/under/above the main destructive event. By the way, you can create a beautiful legend-backstory in the style of Ragnarok, so that no questions arise.