In a desperate attempt to be with her friends again, Twilight finds a book deep within the library of the Castle of The Two Sisters. Within it is a spell that will allow a pregnant mare to be infused with the Elements and, essentially, give birth to a reincarnation of the ponies who were imbued with their power. Unwilling to employ a surrogate because of the extremely personal nature of this endeavor, Twilight takes it upon herself to bring her friends back into the world at any cost. With the help of Spike, she picks out a suitable stallion for the night and performs the spell. She sequesters herself within her castle for the entire pregnancy, embarrassed to show herself among her subjects in a weakened state. She has the foals within her study, Spike as her only comfort.
This is a few days after the foals are born. Twilight makes a very protective mother to the foals who she hopes against hope will become the friends that she misses so much… if even for just a little while.