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After the catastrophe, fortress after fortress rose from the wasteland. Weird celestial phenomena such as extremely hot days and extremely cold days have caused 99% of the plants and organisms on the planet to become extinct. Natural selection, survival of the fittest. Everyone needs to survive in this world without hope and future. The "cursed spirit" bred by nature gives humans superhuman strength to fight against continuous evolution, just like the wasteland creatures in myths and legends: Zombies who are indestructible and know no pain; A cunning, cunning, and powerful mutant; A monster as big as a building that breathes fire and ice... All this story has to start with Fortress No. 1452...