Luna's refusal to cross paths with her sister's mentorship told Twilight one thing: Luna was keeping a secret from her. After a long research project, she understood much of what this new magic did, but not how she could do it. Upon receiving Celestia's permission to train, Twilight discovers that the how is less important than the why.

Living the Nightmare is a short follow up to an unanswered question in Shades of Grey that sparked reader's interest. I was going to wait until the rewrite of the main story was finished, but things have gotten complicated, so here it is anyway.