【Fine Iron】
It is a kind of advanced resource and it is used for training advanced soldier（the Tery Knight，lv.12 troops，lv.11 troops etc）.
When player want to heal these soldiers，you will need the Fine Iron too.
Player can get the Fine Iron by buying packages，and at meantime，joining the event in game can also get this，like the Border Mineral Vein Attack. Besides，the Civilization Fortress will output the Fine Iron.
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Game Guide for Clash of Kings