This story is a sequel to A Wish for the Ages
Rarity never thought she’d be asked to reprise her role as Princess Platinum, especially not this way, and especially not involving her sister as well. But she understands the importance to Equestria and Unicornia.
Even if it might mean that she can’t be Rarity ever again.
An honorable mention in Imposing Sovereigns IV, using the prompt Princess Platinum/Courage