Premium Miracle Cubes are used to reset revealed Potential stats on equipment items. Items with Potential are only available as drops from monsters, if a Potential Scroll or Tim's Secret Lab has been used on a normal item, or if items with Potential are fused. They have a 25% chance to add an extra line of Potential to your item, which is much higher than regular Miracle Cubes or Super Miracle Cubes. The maximum lines of potential an item can have is three. Each Premium Miracle Cube can only be used once. This item can be found in the Game section under the Etc. tab in the Cash Shop.Here's how to use a Premium Miracle Cube:
As a bonus, you will receive a Miracle Cube Fragment in the Use tab of your item inventory. After you collect five of these, double-click them to obtain a Potential Scroll, or combine ten to earn an Advanced Potential Scroll.