Shadow's POV
Shadow woke up in a room decorated with beautiful fabrics. There were things for sewing everywhere, and dresses were placed on mannequins. He picked himself up off the floor, and turned to see a porcelain white unicorn with a purple mane laying on the ground. She had been stabbed with hundreds of pins, her eyes were torn out, and she had been sliced open from the neck down to her hips, with her entrails laying around. He had done this. He knew from the dried blood covering him, and yet he couldn't remember anything. He was losing control. He activated his illusion and left the house, passing the body of… A young mare. Similar in colouring, but her mane was lighter. She had been killed as well. Her throat slit and her eyes removed. Shadow had gone to far without even knowing it. He knew who he had to see. The one person who knew anything about things like this. The only other non-royal alicorn in Equestria.
Shadow arrived at her home. It was older than even his. He entered and walked to her living room where she sat. "Shadow Moon, I knew you'd be coming." She said as he sat down across from her. "I need help, Crystal." he said. "I'm losing control." She looked up. "I know that you're the eyeless killer. That's what they're calling you now. You are in a very bad state. I can tell you why, for a fee." She said, staring at him with her blind eyes. Crystal Oracle had been blind her entire life, but she had a talent for seeing past the physical world. "Fine." He said, and slid a bag of bits across the coffee table. She levitated them out of site. "Shadow Moon, you are possessed. By a demon." She said, looking down and closing her eyes. Shadow's eyes widened. "What?!" He asked. He couldn't believe it. "Yes. It is very powerful. I can sense it physically. Without looking into your soul. Your body is too strained from sharing two souls. His is not complete, however. Otherwise he would be much more powerful. He is beginning to take control of you. Do things you do not want to. You must remove the demon from your body, but you can only do it with a talisman." She said. "A talisman? But there's only three of those in the world…" He said. "You will need to find one, Shadow Moon. It is located in the Everfree Forest. You will know the way. It lies within the demon's knowledge." She said. "Now go." He left her home. A demon. He needed to remove it. Before it hurt Silver.
Pinkie's POV
Rainbow Dash had called a meeting earlier, but Rarity hadn't arrived. Pinkie set off to find her. Sleeping in really wasn't like her. She knocked on Rarity's door, but no one answered. That was weird. She opened it up and walked inside. "Rarity!" She called out, with no answer. She was curious, and went upstairs. And she found Rarity's body. But instead of crying out in horror, she just started to laugh. Oh no, her evil side was taking over! But it was too late. Her hair went straight, and her laughter echoed throughout the house. She picked up a pair of scissors, and went to do what she wanted to.
Shadow's POV
Shadow was walking through Canterlot Station when he saw guards piling onto the train. One of them was yelling about a murderer. He got onto the train, and they soon arrived in Ponyville. Buildings had broken windows, bodies lay about, crushed, stabbed or slashed. He ran out, and saw her. A pink pony with a straight pink mane carrying a pair of scissors. The single eye he could see showed that she was obviously insane, and she sensed something about him. She ran to him and swiped at him with the scissors, but he dodged out of the way. "YoU kIlLeD hEr DiDn'T yOu?!" She cried, insanely. Shadow decided the jig was up. He dismissed his illusion, revealing his true form. "It's time for you to stop, whoever you are." He said.
"ThE nAmE's PiNkAmEnA, pUnK!" She cried, and slashed at him again. Shadow threw her away with his magic and flew towards her, but she got up with super speed and slashed him with the scissors. She punched him and kicked him over, but he made a powerful kick with his back hoof that sent her flying once again. She got up and he used his magic to smash her through the wall of the building, and she landed inside. Then she stood up, and her eyes lit on fire. Demonic energy surged through her. A demonic, curved dagger appeared in her hands as she said "YoU'rE gOnNa HaVe A bAd TiMe!"
She smiled insanely as demon horns grew from her head and she shot a blast of black and red fire at him that sent him flying. She flew over to him and picked hm up with telekinesis and smashed him through three buildings. He was in so much pain as she landed next to him and drew closer with her knife. She was about to stab him but the grabbed the knife between his hooves and pulles it away, using it to stab her in the leg. She laughed maniacaally and threw him into the air where he flew after him. She grabbed him with her magic and smashed him back onto the ground, creating a crater. She landed in front of him and pulled the knife from her leg. "TiMe To DiE!" she cried, raising the knife to stab him again. Shadow needed soething, anything to defeat her. Then he heard the demon speak in his head.
"Strike true, brother." it said. Then his eyes lit aflame and demon energy blasted out of his body, throwing Pinkamena away. He flew up into the air as he partially transformed into a demonic pony. He grabbed her with his demon energy. "It's time for you to burn in hell." he said, the last three words in a voice not his own. He smashed her through buildings, grabbed her knife away, and plunged it into her stomach. She finally cried out in pain. "Bye bye." the demon's voice said, and as Shadow raised his hand demonic spikes of obsidian burst from the ground and impaled her every which way. A blast of demonic energy came from her body and surged into Shadow. He felt his power increasing. His demonic form faded away. "That was fun." the demon said. Perhaps this demon wasn't that bad after all. Suddenly, ponies rushed up to him. "That was amazing! You killed that monster!" They were all asking for autographs, praising him. Shadow flew away. Perhaps he could… Control the demon?