The Crystal war has been going on for 4 years, for 4 years, Sombra has been keeping three prisoners in his dungeon. Now the war will finally come to an end, this is the story of Rainbow, Pinkie and their comrades. They have been there since the first days, now they will be there, when Sombra's army falls. This war has cost everypony something, whether it's a limb, a friend, or a family member. Hardened by this war, they grown numb to the idea of death.
Equestria can finally at long last live in peace. Yet, in order to end the war, Celestria must do something she considers deplorable.

Image taken from Google
Edit) A few fixes have been made and a character's name changed.

We know, that the princesses are wise leaders and care about their fellow ponies. Yet, there is one thing we don't know. Where did they come from, are they really the immortal goddess, we all believe them to be. Where did they come from and is the real story of their lives. Are they the last of the naturally born alicorns. The only survivors of a great disaster, that claimed a once proud city. Are they curse to live thousands of years, carrying a painful memory.
Image taken from Google images.
(Alternate Universe due to the princesses' lines in the Season 6 premier. "That a natural born alicorn is beyond even their understanding.")
This story needs to be updated and needs at least another chapter. How I thought this was ready to be posted I don't know.