A doomsday novel about the protagonist's weapon, a spear

If the protagonist used a spear as a weapon in a post-apocalyptic novel, the following example could be used: The novel was probably a story about the end of the world. The protagonist was a warrior who used a spear. In this era, everything in the world fell into chaos and destruction. The protagonist was forced to survive in this dangerous and fearful environment. The protagonist may experience many difficult battles and adventures against various enemies. He might need to constantly adapt to the changes of this era, find a way to survive, and work hard to protect the people and things he cherished. In this era full of magical and sci-fi elements, the protagonist may encounter all kinds of mysterious creatures and forces, which will constantly refresh and change his understanding of this world. At the same time, he may also face many challenges and difficulties, but his courage and perseverance will make him keep moving forward and eventually become a hero of this era.