how to use fire crystal in whiteout survival#whiteoutsurvival

Fire Crystals are a special kind of resource in Whiteout Survival that become available when your city’s Furnace reaches level 30. You have the option to use Fire Crystals for upgrading different buildings within your city. These particular upgrades are referred to as Fire Crystal upgrades and are divided into levels FC1 through FC5.
The table above displays the quantity of Fire Crystals needed for each building that qualifies for Fire Crystal upgrades. Remember that you must initially upgrade these buildings to level 30 before you can start the Fire Crystal upgrades.
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