In the fifth season, Sailor Moon uses the Silver Crystal (which has become her own starseed) to counter the attacks of Chaos and purify Galaxia's body, returning Sailor Galaxia to her role as a heroine.
In the fifth season, the Silver Crystal (which has become Sailor Moon's own starseed) is shattered by Sailor Galaxia. She then purifies Galaxia's body, returning Sailor Galaxia to her role as a heroine.