I'm writing a post-apocalyptic fiction where the main characters are tribals/natives who survived the apocalypse, but lost the understanding of the ancient technology, and sometimes even worship it (mostly inspired by the Grounders from the 100), living on an Earth that changed after the apocaplypse full of mutated plants and animals and new types of weather like acid rains.
The question is : What kind of apocalypse (Nuclear war, Asteroid, Volcan, Space ...) that is suitable for this scenario to happen :
- Tribals who lost understanding of technology
- Mutated plants, animals and weather
- Four or five generations has passed after the apocalypse
- Some survivors on bunkers fully understand technology and even inventing a developed one