Over the following weeks, Flurry and Twilight spend all their time together in the restricted section of the Archives reading through the Lost Volumes of King Sombra. "Sombra is what they call an umbra, a pony made entirely of shadows. Unlike normal unicorns, they are born with an affinity for black magic and crystals. Their weakness above other things is love, strong and pure, and joy magnified by the Crystal Heart."
"Look at this," says Flurry to Twilight who comes over and looks where her niece is pointing. "I think this is the way we can defeat Sombra and his shadow and crystal army for good."
"I think you're right, Flurry," responds Twilight. "And with a magnifier spell added on top of the love and joy of the Crystal ponies, we can destroy Sombra for good."
"Well, I hope you're right, I'm just ready for all this to be over."
"Me too, Flurry, me too."
Twilight takes Flurry in her hooves and comforts the crying mare. They then go and tell the good news to Shining and Cadance which actually gets them out and ready. Cadance runs off to get the Crystal Heart and Shining to get all the ponies together in the middle of the town. Twilight and Flurry run to the center where they are soon met by Cadance and the Heart which she puts in its holding crystals. She then helps Twilight and Flurry cast the magnifying spell on the Heart. That's when they look up and see smoke on the horizon as they see Sombra and his army come into view. Everypony then follows the royals' lead as they kneel down and feed their love and joy into the Heart. As they do this, Shining and his guards do the same in a perimeter around the Heart. This luckily fends off Sombra for good as he banishes into the ether along with his shadow pony and crystal zombie army. As they get up and see the dissipation on the horizon, they cheer in victory. "We did it!" squeal the royal family as they embrace in a hug.
Elsewhere in Canterlot, the royal sisters get the news that Sombra and his armies have been defeated by the Crystal Heart and the ponies of the Crystal Empire. Needless to say, they're relieved. "I'm so glad they're all safe, Twilight, Cadance, Shining, Flurry Heart, all of the Crystal Ponies, everypony."
"Yes, dear sister, as am I," responds Luna as she puts her hoof on her sister's back. "But you and I both know, Sombra wasn't their only problem. Chrysalis is still out there lying in wait to destroy the Empire."
"Yes, I know, dear sister," responds Celestia, "but I have a feeling, they have that too under control."