To Trade a Magic Item, go to the Artifacts section and click the Trade button to open the Magic Items Trading page.

You can trade multiple Common Magic Items for a Rare Magic Item of the same monster, as shown below. You can also trade multiple Rare Magic Items for an Epic Magic Item.
Use the Reverse button to switch the type of Magic Items you want to trade.
Note: The maximum number of any Magic Item you can hold is 99. Once you reach this limit, you won’t be able to collect more.
💡Learn more about: Lucky Cat Item Trades