They shouldn't have blamed themselves. While it was true that their actions did bring about the end of Equestria, the entire planet was already doomed and slated for destruction anyway. The outcome was simply unavoidable.
This did little to ease Twilight Sparkle's guilt, however. She had still chosen to research those mysterious ruins at the behest of the princess. She had chosen to decipher the symbols that lined the inside of the temple. She had chosen to inscribe those symbols in a spell and mail the result to Rainbow Dash. The only consolation she could take was that, while by her hand Equestria had been annihilated, it was also by her hand that the Pony race would be saved.
Yet, contrary to her conviction, she did not summon the meteors. They were already here. All they can do now is play the game presented to them.
This story, The Most Dangerous Game, is a pony crossover with Homestuck, by Andrew Hussie. However, I am doing my best to ensure that knowledge of the source webcomic is not required to follow the story, while avoiding making the story boring for existing fans of Homestuck. If all goes well, you should be able to enjoy the story regardless of whether or not you are familiar with what it's based on.
Yeah, it's been done before, but I'm not posting this for praise. I'm posting this because my stupid muse won't leave me alone until I do. Motivation is a fickle thing sometimes.
I do not promise to update. My higher priority is World Without Rainbows.
Image is modified from darlimondoll.tumblr.com. Used without permission, but I'll remove it at her request.