This is a fanmade sequel to The Friendship Test by Magpiepony!

Rarity is forever left living with the guilt of what she did to her friends, to Fluttershy.

She betrayed not only her friends, but her sense of peace and freedom. Now forever held captive by her guilt, Rarity is barely herself. The only thing that will ease the gnawing guilt… is revenge.

Rarity is completely powerless alone against Starlight, but a couple ponies may be able to lend a helping hoof and help her succeed in avenging the only pony more guilty than Rarity herself.