Ethereal Vow Six-Star Evolve Diamond

The gem with the purest power of the Astral can evolve the Senshi "<Ethereal Vow>Novija" to a higher star level.
It can be given to a Senshi through the "Give Gift" button in the Senshi interface, and can increase the star level up to Six-Star.
You must own a One-Star Senshi before you can give this gift, and it increases the star level by one each time. After evolving, the existing star energy will reset to zero.