A/N: Here comes the final chapter of Serenity I hope you enjoy this chapter because I enjoy writing every chapter for my fanfics maybe in the future I will get more inspiration for more fanfics that you will enjoy. If you are just joining the story then please be logical about this and start from chapter 1.

Enjoy ; )

The Pegasi guards were over the darkest part of the Everfree Forest at this point, although they followed from Celestia they dare not return with Rarity in such a state. One sentry alerts the head guard Typhoon, "Sir I may have something." The squad of ten moved to the location, they landed silently on the ground as not to alert anypony who wouldn't see them as friendly. They approached a large cave and went inside to scout it out, they continued walking for what seemed like an hour, Typhoon peered his head around the corner and nothing. He called to the rest of the squad to allow them to join him, "What do we do now captain?" asked one of the guards, "Take a look around, let's see if we can find any leads," the squad decided to fan out in two groups of five. Typhoon was in charge of team one, they searched for any trace of Nightmare Moon or the missing Royal Guards, a noise gained their attention. Typhoon and his squad began to move towards the noise, he turned the corner to make sure it wasn't a hoax or misleading and that's exactly what they found, nothing more than a dead end. Then they heard cackling, the squad formed back to back making sure they wouldn't be flanked, Typhoon heard the screams of the other squad in distress. His raced back to where the screams were coming from, they saw a helmet on the floor.

Assuming the worst Typhoon decided to call the retreat. The squad flew out of the cave to escape, but they encountered very rough weather. They wind was blowing fiercely, it was hailing as well causing their armour to be dented and this made flying uncomfortable, Typhoon tried to make contact with the rest of the squad. When nopony answered he turned his head to see that they were gone, with the wind and hail stinging his eyes he could barely see anything, he then heard a distress call from the radio link between the Pegasi guards, "Can anypony hear me, I can't find my squad anymore the weather is too rough, somepony help." Typhoon called over, "Where are your co-ordinates?" The pony answered, "By the sound of the clarity of the transmission we have I'd say we're about a few metres away from each other." Typhoon then activated his beacon which was a small lantern. "I can your light I'm making my way over to you now." Typhoon saw the pony come from the clouds and said, "So have any ideas where the rest are?" The sentry shook his head, "No in the slightest," Typhoon made the transmission, "Anypony from the squad, this is Typhoon, the rookie sentry and I are going to head back to Canterlot we cannot stay out any longer, if anypony receives this head back to Canterlot." "Let's get out of hear." The sentry nodded and they flew back towards Canterlot.

Once they left however, the weather stopped as if it was placed there. The ground was occupied by the remaining squad of pegasi guards, they were on the ground due to the sheer intensity of the storm. The second in command, Thunder Bolt, stood up and took a head count, unfortunately his radio was damaged during the storm. Then all of a sudden the squad was pinned to the ground by none other than Luna's Royal Guard but they were different, in fact there were more, then before them stood Nightmare Moon. She used her magic and the Pegasi Guards began to transform, their wings became like dragon wings, their armour turned into a deep silver, their colour became black and their eyes were yellow with slits for pupils. They bowed to Nightmare Moon as their queen.

Celestia had locked herself in her bedroom for a few hours now, but she knew she couldn't stay there forever, she had to take care of the nightly duties that Luna had left behind. She went into the throne room and began to meditate, she would need to calm herself for the probable fight with her sister again. She knew deep down she couldn't beat Nightmare Moon or Luna in fact, her sister although being younger and smaller than her was still powerful. What she lacked in wisdom and size she made up for in pure power Celestia could never beat Nightmare Moon without the elements of harmony, and although she was able to lower and raise the moon and sun, Luna could pull the moon out of orbit if she wanted to or travel there when she pleased. Celestia couldn't concentrate, she knew Nightmare Moon was powerful, but every time she thought of a feat she accomplished she also thought of how Luna could accomplish more than her just in her weakened form. She didn't know how she was going to beat Nightmare Moon without trying to banish her, she decided that she would need the elements of harmony to defeat Nightmare Moon.

Rarity was in her bedroom looking towards the Canterlot hospital, she had been crying. She had received a letter after her argument with Celestia regarding Serenity, she needed to make a decision. Either keep Serenity on life support for the remainder of her days or allow the hospital to pull the plug. The words of the letter replaying in her head, "Dear Miss Rarity, unfortunately it seems your cousin Serenity will not make a recovery from her coma her condition is too dire at this point, you will have to decide to keep her on life support or allow the hospital to pull the plug you have 48 hours to respond." Rarity went to bed and her dreams were haunted by Serenity's death over and over. The next morning she was awoken by Twilight, "Rarity there might be something on Nightmare Moon," Rarity climbed out of bed and went straight to Celestia's study. She sat at her place and Celestia spoke, "The Pegasi guards have picked up a transmission mission, Typhoon if you please." Typhoon stood up and broadcasted the message, "To my dearest sister Tia, if you want to face me then come and face me. But bring your army because mine is ready for you and your elements of harmony, you will find me at our previous castle, see you soon."

Celestia sighed, "Phalanx assemble the army, it seems we will have to move now in order to reach the castle by nightfall." Phalanx saluted and he left with Typhoon and the sentry to prepare. She turned back to the friends, "If you wish to flee you may do so, there is no dishonour in doing so." "Your majesty we will stand with you or die trying," answered Rarity. Celestia bowed her head to Rarity, "Maybe you should say goodbye to Serenity." Rarity nodded and went to the hospital while the rest stayed and readied for a battle. She walked into Serenity's ward and stood next to the bed and sighed, "You know I'm going to battle soon and I just wanted to say... I'll be back of course but I also wanted to say..." she couldn't she just couldn't say it. A doctor pony walked in, "Are you Miss Rarity?" she nodded, "Have you made a decision?" she nodded again. She looked at the doctor and said, "At half past nine tonight pull the plug." The doctor nodded, Rarity walked back to Serenity's, "I just wanted to say... goodbye..." she burst into tears at saying the last word.

She ran out of the hospital with tears streaming down her face, yet she didn't only feel sad but was also angry at Nightmare Moon, Serenity could never have a normal life anymore it was taken away from her. Rarity entered the castle and her friends hugged her and shed tears of their own for Serenity. Rarity took her necklace to wield the element of Generosity, she and her friends walked out of the castle and met Celestia and the Canterlot army outside the city in the fields.

They began to march towards the Castle of The Two Sisters, the castle where Celestia and Luna ruled before settling in Canterlot. The Elements of Harmony were marching at the back of the army because they were crucial to the battle, if they were on the front line they may not even see the first minutes of the battle. Rarity hung her head low due to sadness, "Don't ya worry yerself over Serenity, I know it's tough but ya gave them permission to pull the plug and as long as ya remember her then she can't be truly dead." said Applejack. Rarity smiled, "Thanks Applejack I appreciate that." They continued to march through the Everfree Forest, the sun was in position for about four o' clock in the afternoon, Celestia knew the army wouldn't arrive by nightfall but continued the march.

Nightmare Moon smiled into her mirror seeing the army move towards the castle, "So you intend to fight, I'm impressed I thought you'd hide behind your walls, nonetheless I think I should give myself a bit of a chance." Her horn began to glow and a mist began to trail the six friends. She smiled and turned to her general, "Prepare the army we're going to have a visit from the Princess." The general bowed, "Yes my Queen." He left to assemble the army, Nightmare Moon returned to her mirror, "Let's see how the Elements of Harmony deal with my new tricks."

The sun had set and the moon rose into its army pressed on by the orders of Celestia in fact she ordered for a quicker pace to arrive before the moon was in the perfect position for Nightmare Moon to harness her full power. The Mane Six could not keep up with the disciplined pace of the army, in fact they couldn't keep pace so much they lost sight of it. "Rainbow Dash fly up and see if can see anything," said Twilight, Rainbow Dash nodded and lifted into the sky and looked around, she returned to the ground soon after, "I can't see anything, there's a dense fog it looks like we'll have to go through it to get to the army," Twilight nodded, "Let's go girls the army doesn't stand a chance without us." They walked into the very dense fog, the mist followed them in. Suddenly the six found themselves in the middle of a circle with six possible routes, they had no choice they had to split up to find the army. Twilight looked around trying to get her bearings, she groaned in pain, she was standing in a field and she saw a field littered with dead guards from the army. She began to panic she then saw Celestia's crown on the ground she saw blood on it, she shook her head and knew it was nothing but a vision. The mist lifted and she continued. The others also had no trouble determining that what they saw was nothing but visions except for one. Rarity was wondering through the mist, she saw Serenity, she ran over and hugged her, "You're alive," She moved her head back and saw Serenity's body without its head, she shrieked in terror stumbling backwards, then she Serenity grabbed her from behind, she had no face she also had tentacles around her neck.

She ran away from it, she tried breathing, then Serenity appeared again with half of her face as a skull, she spoke, "Look what you've done to me, you killed me." Rarity backed away from her. Suddenly she saw she was standing in blood she looked up and saw Serenity on the ground slitting her wrists badly in fact she cut deep enough to destroy the veins. Rarity then saw Serenity hanging by a noose on a tree, she couldn't take it, she was beginning to lose it. She curled up into a ball and looked up to see Nightmare Moon laughing at her, suddenly she was overcome by something more dangerous than sadness, pure rage she wanted Nightmare Moon dead. She stood up and the mist disappeared she didn't know where her friends were but she marched towards the castle of the two sisters.

Celestia and the army arrived at the castle and stood in the field before it. Ahead of them was the army of Nightmare Moon who stood before them at the head. She smiled, "So my dear sister you decided to face me and my army," "You will not win Nightmare Moon we will stop you," responded Celestia. Nightmare Moon only chuckled, "We? I only see you." Celestia turned around to see the Elements of Harmony not behind the army, she looked back at Nightmare Moon, "What have you done?" Nightmare Moon smirked, "I wonder how long it will take me to defeat your pathetic army," At this Celestia flew at Nightmare Moon and both of them began their fight which allowed the two armies to charge each other.

The Elements of Harmony heard the battle and found themselves at the edge of the battlefield, Twilight surveyed the battle and saw Celestia and Nightmare Moon fighting in between the two armies. Twilight looked around and asked, "Wait, where's Rarity?" The others looked around, they had lost their friend in the mist. "Well I think we should at least have some fun before she shows up," said Rainbow Dash cracking her hooves, "I'm with you Dash let's take 'em on," said Applejack, "Count me in," said Fluttershy which took them all by surprise, "I will Pinkie Punch them," said Pinkie, Twilight sighed, "Let's go get them." They rushed towards the middle of the battle.

Rarity had seen her friends rush into battle, she however was planning her attack, she wanted a direct route to Nightmare Moon. From a distance she tracked Celestia and Nightmare Moon through the battle waiting for the perfect moment.

Meanwhile...

The doctor who was due to pull Serenity's plug stood in the ward and looked at the clock. The time read nine o' clock thirty minutes before he would have to end this pony's life so short, he saw something in that pony, he saw his own daughter, who like Serenity was placed on life support and he was faced with the decision to allow the hospital pull the plug.

He was there when they pulled the plug, he saw the machines switched off, he saw his daughter's breath slow until it stopped, he heard the heart monitor turn into one continuous beep. He began to cry for this pony he had only met this evening, this pony who reminded him of his own daughter. Serenity however was far from dead. She was trapped in her dreams, she was at the battlefield, she saw how Celestia battled Nightmare Moon she saw how her friends were in the middle of it all she saw her cousin Rarity waiting for the perfect moment to strike Nightmare Moon for her.

The battle only heated as both armies were equally matched neither one faltering. The Elements of Harmony had formed a circle around Celestia to protect her form attack from behind or from the flanks. Celestia and Nightmare Moon were exchanging blow after blow with their horns which were glowing also both were equally matched. Nightmare Moon looked to the sky and saw the moon in perfect position, she grew irritated, she knew she couldn't harness its power while battling Celestia. "ENOUGH!" she shouted and anypony that surrounded her were blown away including Celestia. She rose into the sky and harnessed the power of the moon, her eyes began to shine white from the intake of the sheer power, an aura of white surrounded her, her wings extended as they transformed into those of a dragon's. She descended and the power could be seen by her white eyes and by the aura that surrounded her.

Celestia and the other Elements of Harmony shot a beam at her. She screamed, after the dust settled she raised her head, "Was that your best shot?Now it's my turn." She displayed her power she lifted Celestia, the Elements of Harmony and the entire army and threw them across the field. They were no match for her, she approached them and smiled, "So do you surrender the throne?" Celestia looked upp at her, "Never," "So be it," her horn began to glow. Rarity seized her chance, "For Serenity!" she shouted as she hurled herself at Nightmare Moon, although being smaller than her Rarity still put up a fight to take down Nightmare Moon. Nightmare Moon saw darkness in Rarity one only she knew all to well and used it to her advantage, "Think Rarity who was it that didn't try to protect your cousin, who was it that instead of using a shield spell allowed my beam to hit her and the ponies behind her." Rarity was having none of it. She continued her assault on the taller alicorn who kept trying to persuade her, "Join me we can rule them, we can force them to do anything, we can make them bring you gems until you are satisfied." Rarity kept going not listening to the one who killed her cousin. "I will never join you!" She lunged at Nightmare Moon and was thrown off, she lay on the ground with the taller alicorn towering over her. "Very well if you will not join me then you will die." She raised her horn and was about to strike her in the chest. "For Serenity!" yelled Rarity, which seemed to echo through the night.

The doctor looked at the clock and it read 21:29:30 and counting, he moved over to the machines supporting Serenity, who was unresponsive, 20 seconds left, the doctor motioned his hoof to the off button, 5 seconds left. The echo reached Serenity. Suddenly her eyes opened and she disappeared from her bed, the doctor was shocked he had never seen anything like it.

As Nightmare Moon's horn was about to strike Rarity she was hit by a magic beam, Rarity turned her head to Celestia who was looking at something else, she turned her head to follow the gaze. She her Nightmare Rarity and she ran towards Nightmare Moon who was just recovering from the beam when she was punched in the face. Nightmare Rarity teleported, she was behind Nightmare Moon who she kicked in the face, again she teleported, she shot a magic beam at the staggering Nightmare Moon who fell to the ground by the power of the shot. Nightmare Rarity called to the Elements of Harmony, "Now do it now, change her back to Luna." They didn't argue and shot a beam towards Nightmare Moon who screamed, "Nooooooooooooo!" On the ground was Princess Luna who was back to normal, as for her army they returned to themselves again even her Royal Guard were normal again. Celestia walked over to her, "Luna are you allright?" Luna looked up at Celestia and asked, "Why am I in the Everfree Forest?" Celestia hugged her sister in joy.

Rarity walked up to her darker self and asked, "Why did you help us?" Nightmare Rarity lowered her head to the unicorn, "Because you're my cousin," Rarity realised who it really was, "Serenity?" She nodded, "This my dear cousin is my powerful form it was activated before I was unplugged when I heard you say "For Serenity"," Rarity hugged her cousin and said, "I'm so glad you're alive." Serenity looked up and saw Celestia approach, "So you are Serenity, all I can say is thank you for saving my sister," Serenity bowed her head, "Thank you your majesty but I cannot stay." "What? But why you only just got here." Rarity asked with tears in her eyes. "I must tend to my own duties now, it was nice to hang out with you for all this time, I shall return someday." At this she disappeared.

The army, Princesses and Elements of Harmony returned to Canterlot. The Mane Six returned to Ponyville, Rarity appointed Twilight as the CEO of her offices in Manehatten. The company became very successful, every time always being voted the best dress making company in Equestria. The years went by Rarity had pictures of all the times she and Serenity spent together, she always smiled at seeing the pictures of the two.

One day after a hard days work she heard a knock on the door, she opened and saw her cousin Serenity as herself again, she had mastered to control her powerful form that what she needed to do, soon Twilight relinquished her position to Serenity who helped the company grow in a big margin making it even more successful. Rarity had received the best designer award three times in a row for the next three years. Serenity often spent Hearth's Warming Eve with Rarity, her sister Sweetie Belle and her friends which she always surprised with her amazing gifts. Rarity and Serenity became like sisters and they continued their visits whenever they gained the opportunity.

The End

A/N: So there you have it Serenity is now finished, I hope you enjoyed reading this Fanfic as much as I have writing it. Be sure to always look out for more Fanfics that I will write or have written if you are interested in this then I suggest reading Princess Luna vs Nightmare Moon in my opinon one of my best or if you want something with Rainbow Dash then I suggest reading Motherly Rainbow Dash my second best that I'm proud of. And like always, Keep Reading and Love Reading while you can.

Bye ; )