Gold can be used to level up your Heroes’ Skills to make them more powerful. You also need Gold to Promote your Heroes, to craft Items, and to purchase Gear and other things in the Shops.You can gain gold by winning Campaign Battles, completing Quests, completing the Crusade, and a variety of other ways. There is also an option to buy Gold for Diamonds by using Alchemy, which you can access by tapping the green “+” next to your Gold total.
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Portal Quest GUIDE