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The broken ancient helmet is an archeological item
found in fossils
with a 5% drop chance. It can be repaired and made into an ancient helmet
. To repair it, put it in the top left slot on the archeology workbench
and 10 relic scraps
in the bottom slot. Repairing your first helmet gives you the "Thinking Cap!" achievement
As mentioned above, it can be obtained by mining fossil blocks. However, it can also rarely be obtained by placing a relic scrap into an analyzer.