"I wish to know the truth" said Twilight.
And thus, she is granted the ability to see and know the truth. Only problem is, the truth begins to scare herand she decides to face it, slowly showing signs of madness to her friends who try to help her the best they can.
But one random pink Pony seems not too worried and actually enjoys the situation, even if she also accepts to help in the end, in her own way.

This is no adventure, this is no "lesson zero" or "party of one" in any way. This is merely a reflexion about the truth and the veil.
Nothing more, but, I hope, nothing less.