After an attempt at a triple sonic rainboom goes catastrophically wrong, Rainbow Dash wakes up on a beach with no idea as to how she got there, how she'll go home, or who the only other pony towering over her is.
While Rainbow and her new companion attempt to answer the rainbow warrior's questions, Princess Luna -- who, along with everypony in Canterlot and the surrounding area, experienced the end result of the attempted stunt -- goes on a mission to find Rainbow, and to exact justice.
Finally, Fluttershy and Pinkie Pie use their connection to their blue friend in an attempt to find her, only for the former to find herself fighting to save Pinkie from sinking into the abyss of the latter's breaking heart.
NOTES + CREDITS:
This is the first story overall in the Timeline-42 series, and is the first story of the Terminus arc.
"Granfaloon" appears with permission granted by Alex Warlorn of Pony POV Series fame.
Most of the colour descriptions are derived from Procato's Color Map with Meaningful Names.
"Aria's Lullaby" is taken from "Mourning Sun" by Fields of the Nephilim, the song being a major influence upon the Terminus arc.