You can trade dragons, resources, and crafting ingredients with other players for crystals.
You can find the following categories of goods on the market:
All players can buy and sell the goods. Players can also set their own prices on the goods they sell
To sell the goods you need to switch to selling mode, select the category you want, click on the “Sell” button, and then select the goods you want to sell.
To buy goods you need to be in buying mode, select the category of goods, and pick the goods you want to buy.