Silken Plumage 4-Star Evolution Gem

The diamond with the purest power of the astral realm can elevate the star level of the star spirit "<Silken Plumage Sheru."
It can be given to the star spirit through the "Gift" button in the star spirit interface, raising the star level up to 4 stars.
You must have a 1-star star spirit before gifting, and it raises 1 star level at a time. After advancement, the original star energy will be reset to 0.