I Open the Treasure Chest at the End of the World

The end has come, order has collapsed, morality has fallen, the darkness and madness of humanity and violence have grown, and mankind has fallen to the bottom of the food chain! When others are still struggling to survive in the last days, selling their souls and bodies for a piece of bread! Zhang Fan was already looking at the pile of treasure boxes in front of him and worrying! "Open the golden treasure chest! Congratulations, you have gained strength +999, physical strength +999, and agility +999!" "Open the purple treasure box! Congratulations on getting 10,000 tons of fresh water, 10,000 tons of rice, and 10,000 tons of beef..." "Open the legendary treasure chest! Congratulations on getting "Mobile Fortress", "Super Tank", "Devil-Conquering Knife", "Fire Bomb*1000", "Ice Bullet*1000", "Physical Recovery Agent*20", "Virus Serum*10"..."