Moon of Darkness 4-Star Evolution Gem

A diamond imbued with the purest power of the astral realm can be used to enhance the star rank of Senshi "<Moon of Darkness> Luna."
It can be gifted to a Senshi through the "Gift" button in the Senshi interface, allowing their star rank to increase up to 4-Star.
You must own a 1-Star Senshi before gifting, and each gift increases one star rank at a time. After advancement, existing Star Energy will reset to zero.