Loneliness of competition

Gretel passed through the energy channel and came to a high-energy continent. After hard cultivation, the energy star collapsed and became an ordinary person again. This continent has a splendid agricultural civilization, but due to the lack of metals such as gold, silver, copper, iron and tin, the civilization stopped in the stone age how to survive and evolve in this lonely civilization has become Gretel's biggest question. We can tap the potential of civilization, resist the ravages of nature and the wars of Civilizations at the same level. However, how can development resist the invasion of foreign civilization, even iron civilization the second brain didn't work out the answer before it was broken, so it was left to the lonely Gretel to try.