King Sombra, now king of equestria had to find himself a more loyal army than the one that Equestria already had. He had gone into the northern mountains and brought four guards at random, and in his saddlebags were what he needed to make this army and its general.
The guards followed him into a cave he knew well. The cave was lit by dim crystals on the walls, the red glow put the guards on edge. They entered a cavern that had a smooth floor, save for grooves that ran in a complex pattern then met in a small bowl shaped indent just large enough for a pony to lie down in. The indent was right in the middle of the pattern and looked rather intimidating, it felt of dark magic.
King Sombra ordered each of the guards to stand on the North, East, South, and West points of the circle. They obeyed but didn’t think that they would survive this, they were right. Sombra put a helm, a chestpeice and a broken black horn in the bowl. Instantly black crystal spikes shot from the floor and impaled the guards, their blood emmediately ran through the groove pattern and began to fill the bowl.
Sombra was chanting in a pagan language the entire time, the blood began to burn in black fire. Very soon the room pulsed with energy, and something began to rise from the pool of blood. It had a long black horn and a helm of silver on its head, it had a silver chestpiece in front of its black torso, on its hooves were silver armored boots. It opened its eyes, which were catlike slits.
Nightmare Moon rose from the bowl blood dripping off her coat and wings. She looked around and saw Sombra standing there.
“Who are you?” She demanded, “and how did I get here?”
“I am Sombra, I have taken equestria from the alicorn sisters. But I lack a loyal army, so I called you here. I want you to be my general, you will have all the respect you deserve and a place of influence.”
“And why should I join you, I can just kill you and take your place.”
“Actually you cant, I brought you back into this world. Meaning I control exactly how much power you have. You can try to kill me, but you will fail and I will find another just as powerful as you.”
Nightmare Moon believed him, she felt her magic restraints controlling her, controlled by the king. She thought for a minute, she could easily be content here, she didn’t want absolute power, only respect. She smiled.
“Well it seems I have little choice.” She said. “Where is this army you want me to lead?”
“Come with me and we will make it.”
Nightmare Moon was confused but obliged, she followed him deeper into the cavern. They passed a few empty caves before arriving at their destination. It was a large cave at the back of the system, and on the floor was a large pentogram surrounded and covered in runes that glowed angrily. Sombra began to put energy into the pentagram and chant under his breath in a demonic language. Nightmare Moon could understand it well.
”Come dwellers of the realm of death. Come those whose rage cannot be quelled. Come those of you who wish to see your tormentors brought to their knees. I will lead you, give me your allegiance and vengeance will be yours for the taking. Awnser this call, the power of the void compels you. Awnser and taste the blood of your captors.”
The pentagram began to glow and a red fire began to glow just above the floor, it began to grow in size. Through the fire came massive amounts of horrifying creatures, they lacked skin of any kind and showed bare flesh everywhere. The creatures jaws were larger than necessary and filled with crooked fangs that sent a shiver down Nightmare Moon’s spine.
The cavern they were in was nearly five hundred feet in diameter, and the demons overflowed it quickly and still more came out.
“Behold,” Sombra said, “The legions of Hell.”
“How many are there?” She asked breathlessly.
“Nine hundred thousand strong, and they make more daily.” He told her. “This army will be infinite.”
“What are your orders?” She asked.
“Reign terror on the citizens, keep them under control.”
“It will be done.”
*****
Big Macintosh was in the middle of harvesting apples for the season, when he heard an unholy shrieking coming from the north. He looked and saw something that made his gut clench, he turned and ran like crazy, he had warn the village.
Nightmare Moon lead the massive army of demons to the small town of Ponyvill. She was instructed to raze the town, and she would be happy to do so. She lead the charge herself, she would slaughter any pony she came across and destroy any building she touched.
The shrieking demons behind and beside her charged wildly, she smiled. She looked at the village in front of her, about two leagues away. She would get there within half an hour.
The town of ponyvill was in panic. Macintosh had informed them of what came for them, they needed to evacuate to the forest quickly. And so they did in a wild panic, everyone grabbing tools that could be used to defend themselves. It took a while but the mayor got them calm and lead them into the forest while keeping them quiet. They got in just in time to miss the army of demons.
The citizens watched in horror as their home was torn apart by demons and the nemesis they believed to be dead, Nightmare Moon blasted the buildings apart looking for ponies but finding none. She roared in rage and citizens moved deeper into the forest. They marched until they reached the old castle, there they decided to take shelter. That was their home now.