5-Star Evolution Gem

A diamond containing the purest power of the Astral, which can be used to promote the Senshi's star level.
You can give it to the Senshi through the "Give Gifts" button on the Senshi interface, and you can raise the star level up to five stars.
You need to have a One-Star Senshi before you can give it away, and you can only raise one star level at a time. After promotion, the original star energy will be reset to zero.