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Assets can be upgraded.
Asset that support levels can be upgraded each time to 1 level higher.
Mines, Palace and workers support levels. Each rarity has 5 level and after asset reaches level 5, then the next upgrade changes its rarity to one higher rarity and its level will become 1.
Cost and duration of upgrading level of assets is very small.
Assets that do not support levels can just be upgrade to a higher rarity.
Last modified 1yr ago