Synthetic nightmare

Revenant began thinking about this deal. Does he need to join this creature or it's just trying to fool him and use? Use him...like a weapon...minion. These thoughts made Revenant angry. He remembered how Hammond Robotics and Syndicate were using him and playing with him like a toy. All those years he had no idea into what he was turned. Nightmare made of metal and remains of flesh. He screamed and pounced Tirek with his hand.

"I am not a fucking minion!" With those words, Revenant began dismembering centaur, who was screaming in agony and trying to release himself. After limbs, Revenant began twisting the head until it wasn't torn off with a terrible sound. Revenant looked at the head and then turned his gaze to the mare who was shaking and sobbing. Revenant approached her and asked:

"What is your name? I must know." Mare opened her eyes and whispered:

"Fluttershy." Revenant looked at the mare and lifted his knife. Fluttershy yelped and closed her eyes. Revenant swang his knife and cut down ropes. Fluttershy began rubbing her arms and said:

"Thanks." Revenant grabbed the centaur's head and put it inside the bag.

"Lead the way to your home or I will kill you." Fluttershy backed away, but then nodded and both headed to the cottage.

Twilight's group. 30 minutes later

"Princess! You better to see that!" When everyone approached the guard, they covered their mouths when they saw dismembered headless centaur's body. Twilight looked at him and recognized.

"Tirek." Everyone turned to her and Rainbow Dash asked:

"What?"

"It's Tirek." Ponies' eyes widened and they looked at the corpse.

"If this creature is so powerful, we will need Celesia's help," claimed Twilight with a serious look.

"Twilight, look!" shouted Applejack pointing to something. Everyone approached her and saw bloody tracks that were leading to the exit of the cave.

"Quick! This way!" With those words, everyone followed Twilight. Soon the tracks brought them to Fluttershy's cottage.

"Oh no. It's inside," said Rarity. Suddenly the door opened and revealed...him. The creature. It was a bipedal humanoid made of metal. Its face was white and eyes were yellow and lifeless. He was holding the bag, which bottom was red.

"What in tarnation is that thing!?" whispered Rainbow Dash.

"Maybe, it's friendly," suggested Pinkie.

"Pinkie, it killed many ponies today and you think that it's friendly?" asked Applejack. While they were arguing, their chatting attracts the guards' attention.

"Twilight, calm down. We need to follow this thing," said Flash Sentry. Twilight looked at him and sighed.

"Yes. You are right. We need-... Wait a minute, where did it go?" Everyone looked at the spot where the creature was standing and saw nothing.

"You know, for spies, you are very talkative." Everybody yelped and turned their gazes to the creature which was standing behind him.

'How did it get behind us unnoticeable?' thought to herself Twilight. Meanwhile, Revenant was starring at them and said:

"I think that you are Twilight." Revenant pointed to the mare, who was surprised by this. "We need to talk." Suddenly Rainbow Dash got into the conversation.

"What did you do to Fluttershy!?" Simulacrum looked at her and said:

"Nothing, just saved this skin bag two times today. I gave her the advice to move out of her place." Rainbow Dash wanted to say something more, but Twilight moved her and said:

"Who are you?"

"Revenant. Synthetic nightmare." Those words a little bit scared ponies. Suddenly something hit Revenant behind. He turned around and saw a guard who was holding a cudgel.

"Bad idea." With those words, Revenant pounced the guard with his arm. Other guards charged at simulacrum, but Revenant was faster them. He sliced the first one's throat, shoved the knife into the second one's chest, and torn out the third one's heart.

"Miserable meatbags, you don't even stand a chance against me." Main 6 was terrified of how simulacrum was dealing with guards like they were foals. Suddenly Twilight came up with an idea and she began charging her horn. Revenant noticed it and said:

"Don't use your magic beams. They already tried this trick on me."

"Oh, this is not a magic beam." With those words, Twilight shot the magic into Revenant, who was sent flying into the tree. He bumped into it and fell to the ground. Main 6 with Flash Sentry began slowly approaching him. Twilight flipped him and everyone saw that his eyes were gray. Not yellow.

"Did you kill him?" asked Pinkie.

"No. Only knocked him out." Twilight used her magic and materialized the purple sphere around simulacrum. She lifted it in the air and commanded:

"Flash, follow me. Girls, check Fluttershy."

"Be careful, sugarcube." With those words, girls headed to the cottage, while Flash Sentry and Twilight headed to the castle of friendship with a simulacrum. When they entered the castle, the guards were surprised to see an unknown creature.

"Don't come close, this thing is dangerous!" commanded Flash. Everyone nodded and backed away, while Twilight put Revenant in the cell and sighed.

"How do you think what is this thing?" asked Flash.

"I don't know. I hadn't seen such a creature before." Twilight grabbed the quill with paper and began writing something on it. When she ended, she called Spike. The dragon quickly approached her and noticed Revenant.

"Twilight, what is this?"

"I don't know, Spike. Send this letter to Princess Celestia." Spike nodded and sent the scroll.

Canterlot

Princess Celestia and Princess Luna were chatting with each other and doing paperwork.

"Ugh, this paperwork is so boring!" claimed Luna.

"Yeah, but that's our last paperwork for today. C'mon, we should-" Celestia didn't end her sentence because the scroll appeared in front of her face. She grabbed it and said:

"It's from Twilight." She opened it and her eyes widened, when she read:

Dear Princess Celestia

Today, Zecora reported about murders in the forest. When we came to the place with guards, I was shocked to see such horrible ways of killing. Then we began following the blooded tracks which were leading to the cave. I with girls found a shelter of sectants and..Tirek. He was killed and his body was dismembered and headless. Soon we met a strange creature that was made of metal. He said that his name is Revenant. Synthetic nightmare. I am certain that he killed those ponies in the camp and in the cave. I hope you will visit us as soon as possible.
Your faithful student, Twilight Sparkle
P. S. I will send you a photo of this creature

When Celestia and Luna read the letter, they noticed another scroll. When they opened it, they were shocked to see him. Simulacrum. Luna looked at her sister and said:

"We need to be in Ponyville tomorrow."

"Agree. If this creature is so powerful, we will go to extreme measures."

Castle of Friendship

After sending a photo to Celestia, Twilight wanted to go to her bedroom, when Spike suddenly said:

"Twilight, look. The creature has a bag." Twilight and Flash saw that simulacrum was holding a bag in his hand. Twilight teleported it to her hands and looked inside. She gasped and quickly threw it to the ground. When the bag fell to the ground, 2 heads came out of it. Everyone gasped and turned around to not see such a horrible scene.

"Now, we know who killed those ponies," said Flash.