This takes place about a year later...
It's been a year since King Sombra has taken over the Crystal Empire and now he's moving on to Appleloosa. Along with his wife. Ever since the Mane Six heard about King Sombra's wife, they've been even more devastated than they were when Twilight "died". They barely hang out with each other anymore. Rarity mostly works in her workshop with Spike, but she barely makes anything with any shade of purple. Spike is the only purple thing she'll accept. Applejack has been at Sweet Apple Acres for a while. She's been busy bucking apple trees. Fluttershy doesn't come out of her cottage at all. If she sees any animal that has anything purple on it, she'll start to cry. Even Pinkie Pie hasn't been her usual self. She doesn't host as many parties as she used to. And she never has any kind of purple decorations, or anything purple, for that matter. Rainbow Dash has just been up in cloudsdale. Sometimes she would fly above Ponyville just to get her mind off of Twilight and King Sombra. Rainbow Dash doesn't even dash anymore. The Mane Six spread apart from each other each day. If they see one another, they just look at each other and face the other direction. It's been like this for months...
"Rainbooooow! Oh, Rainboooow! Where are you Rainbow Dash?" Pinkie Pie screamed at the sky. Rainbow was resting on a cloud, looking at the huge, never-ending, sea of blue. She rolled her eyes and answered, "What do you want Pinkie?" The pink earth pony was surprised at Rainbow Dash's voice. She hasn't heard from her in months! "We need you at the Ponyville clinic, hurry Rainbow!" Rainbow Dash watched as Pinkie Pie galloped away. She got up on all fours and flew down to Ponyville. Pinkie was only a few feet ahead of her, so she quickly caught up with her.
When Pinkie and Rainbow entered the clinic, they found Nurse Redheart doing something to Strongheart's skinny leg. They also saw Applejack huddled over Strongheart. "AJ, what happened?" Rainbow asked. Applejack looked furious. Her cheeks were a frustrated pinkish color, and her eyebrows were furrowed. "Appleloosa has been attacked and little Strongheart, here, got hurt." Rainbow Dash was confused. Appleloosa was attacked. But by who? Nurse Redheart spoke while bandaging Strongheart's knee. "Strongheart told me that these stallions in black, metal armor, had attacked her herd and all of the citizens of Appleloosa. She didn't know who sent these stallions, but they were a nuisance..." Redheart's voice trailed off as she finished the sentence. "I got a feeling who mighta done this..." Rainbow's eyebrows furrowed. "King Sombra." She snarled. Everypony in the clinic went silent and stared at the young, blue pegasus. "Well things just got awkward..." Pinkie claimed. Rainbow rolled her eyes and began to walk out of the clinic. "Rainbow," Applejack started. "Where ya goin?" Rainbow Dash stopped dead in her tracks and faced back toward the orange earth pony. "I'm tired of King Sombra ruining our lives! I never thought he would go this far, but he has! He's gonna take over Ponyville eventually, and we'll be just as miserable as those Crystal Ponies! We've gotta put an end to this somehow AJ!" The blue pegasus turned back around and flew out of the clinic, on her way back to Cloudsdale. King Sombra has no idea what's coming for him.