Apple Bloom, Sweetie Belle, and Scootaloo are all friends. Together, they can do anything! They, as the Cutie Mark Crusaders, will find a way to earn their cutie marks!
But trouble arises when Apple Bloom and Sweetie Belle get their cutie marks and leave Scootaloo alone as the only crusader left.
If I have to say this story was inspired by anything, I'd say it was inspired by BlackGryph0n and Bassik's song: Crusader.
It's an amazing song, and I feel inspired by it in some ways.