"...if it works that is."

As each of the "Remane 5" passed away, their bodies were secretly sealed in specialized caskets filled with honey and later hidden in a secret underground laboratory in Ponyville as part of a rejuvenation project only known to a very selective few, including Nyx, Hemera, the celestial sisters and the crystal empire royals. 127 years after the last of them (Fluttershy) shut her eyes for the "last" time, in an effort to boost morale and turn the tide of The Hundred Year War in her favor, Nyx requests the team of the time to initiate the project's goal, even if it's in the experimental stage. The result of years of science and magic, study and obtainment are about to come to fruition, in part...

The Princesses of Harmony.

A moment in the beginning of The Nyxian Alliance. Based on Sherlock Holmes in the 22nd Century.