4-Star Evolution Gem of Summer Queen

The diamond with the purest power of the astral realm can enhance the star level of the star spirit "<Summer Queen> Reina."
It can be given to the star spirit through the "Gift" button in the star spirit interface, raising the star level up to four stars.
You must have a one-star star spirit before gifting, and it raises one star level at a time. After advancement, the original star energy will reset to zero.