my guess of how tiers(strength/item/skill/building) work were black iron, green bronze, white silver, yellow gold, white platinum, diamond, extraordinary, epic, legendary, mythical. quality of conventional soldier/building is divided into basic, beginner, intermediate, advanced, special, kingdom, empire, vine kingdom, high/scarlet. the scale of the minerals is divided into miniature, small, medium, large, extraordinary, epic, legendary, and mythical. let me know what you guys think?