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Li Jian traveled through time and came to a village. This world is rampant with monsters, which has put great pressure on human survival. The population reached the threshold of 500, triggering a level one beast wave. The population exceeded 10,000, triggering a secondary beast wave. The population reached 100,000, triggering a level three beast wave. Fortunately, the shelter built by Li Jian traveled with him. When he first arrived, he learned that his village was facing the threat of powerful nightmare beasts. Fortunately, Sanctuary also mutated, giving him unprecedented powers. "Collect the corpses of nightmare beasts and your experience points will soar!" "Mining ores will increase your experience points!" "Explore the unknown world and gain endless experience points!" With these rich experience points, Li Jian quickly mastered master-level fighting skills, cold weapons, archery and other skills. Shelters are also being upgraded. Shelter→Mobile Fortress→Mobile City→Floating City As she explored the world in depth, Li Jian discovered that something was wrong with the world... (Although this book contains a refuge, it is not a doomsday novel. It can be regarded as a fantasy novel with a science fiction style.)