strategy game, Civilization VI, iron resource, mining technology, early game, warrior upgrade, swordsman unit, strategic resource, tile improvement, mine, worker unit, city-state, territorial expansion, diplomacy, trade, fog of war, exploration, hex grid, map terrain, resource icon, iron deposit, adjacency bonus, industrial zone, district placement, military tactics, game mechanics, turn-based strategy, empire building, resource management, soft light, isometric view, 3D graphics, detailed textures, realistic art style.