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CONTAINS SPOILERS
How to walk on lava and hazardous areas
Early on, you'll notice that you take damage when you attempt to walk on hazardous terrain such as lava. In order to do so it requires an equipment upgrade called Promethean Insulators. This equipment is only available in the 5th Biome (Fractured Wastes). It's locked behind a triangle shaped a door that requires an Atropian Key. Your map may vary so keep an eye on such doors and save a key.