This system is released along with Defense Mode.
Players can obtain Gold Coins and Weapon Cards while playing Defense Mode. These items will be stored in Storage, under the Item tab (ZM).
To combine a weapon, players will need the Blueprints and the amount of Gold Coin required for the combination. Once the two requirements are met, clicking "Use" on the Weapon card will bring up Combine Menu, and players can click the "+" button to craft the weapon. It will then be stored in the player's storage (Weapon tab).
All weapons which are crafted are temporary and or 7 days.