Immigrant hull

That's a respirator. Hull geist, where the weather is bad, the first immigrants can't adapt to the climate. Many people died, but they persisted. After several generations of efforts, their lungs have been immune to air, and their bodies have become very strong because of years of efforts, but at the cost of relying on breathing apparatus to survive. Have you ever noticed that all the people on Hull geist who don't have respirators are big shots? When you say bulb eyes, you actually mean night vision goggles and heat. Don't laugh at the collection of glasses radar. This thing is very advanced. In fact, the selling point of "Killing Zone" depends largely on the plot. You can find the answers to these questions in the official history of the killing zone.

For example, the origin of Hull geist and the feud between Issa and UCN all laid a long foundation for these games, and the war happened very late.