I always thought that there should be the ability to exchange 'Ashen Rocks' Towards ash purchases.
imagine
43,000 ash and a black rock, they could buy the upgrade.
45,000 ash and a grey rock, they could buy the upgrade.
47,000 ash and a white rock, they could buy the upgrade.
This gives users the ability to 'break' a black rock with a purchase, and ease the amount of ash required to purchase it. But sacrifice the potential FULL ash reward from breaking the rock if you made a full price purchase.
This gives players more incentive to use black rocks, as well as lowers the purchase cost (time investment) for farming ash.
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