At the wedding hall
Every pony in the room, including Chrysalis, is shocked at this new Twilight appearance.
"U ... um ... Princess Celestia, please tell me that Twilight just became an alicorn princess, right?" Rainbow Dash asked not sure.
"I'm sorry Rainbow Dash, but I don't think Twilight has become alicorn princess. Because as far as i know, no alicorn has such a shape. And furthermore i can feel Twilight possesses a much darker power than Discord and Nightmare Moon" princess Celestia answered anxiously.
"D... D... Dark? W ... What do you mean princess Celestia? Could you mean ... T ... Twily using dark magic?" Shining Armor asked in fear. He could never have imagined that his sister would use dark magic. And it was all his fault for not believing his sister and chasing her out of his own marriage.
"I really hope not like that. But no matter where this power come from, this power was really dark. I have never seen such a dark magic even if it is the dark magic of king Sombra. It ... Makes me feel scared ... A feeling that I forgot a long time ago." Princess Celestia said in fear.
'I... It's for me !!! It's all my fault! I should have listened to Twily! I shouldn't have kicked her out of the wedding and abandoned her! What kind of brother abandoned his sister!? Shining Armor you are so stupid!!! What did you think!?' guilt and regret were slowly swallowing him. He was angry with himself for what he did in the wedding rehearsal.
'T ... Twilight? D ... Dark magic? I ... Impossible!? Twilight will never use dark magic ... Right? Who am i kidding, It's all my fault, I should have stayed there with Twilight. Instead I was too focused on my sonic rainboom performance and abandoned Twilight. I'm the Element Of Loyalty, what kind of loyalty would abandon my friends to console a fake!?" Rainbow angry with herself for abandoning Twilight.
'Twilight can't use dark magic! That cannot be true. But princess has no reason to lie to us, And I'm Element Of Honest, I can't deny the truth ... And I shouldn't deny fact that Cadence is fake. I thought there was something wrong with princess Cadence, but because I was too focused on the standard
being married to her so she denied that fact and said that princess Cadence was just stressed out before the wedding ... And I abandoned Twilight. I don't deserve to be Element Of Honest' Applejack thought in frustration.
'I'm Element Of Generous ... But I wasn't generous when leaving Twilight and checking out the impostor who treated me and my friends badly. I will definitely do everything to get Twilight forgiveness.' Rarity cried thinking about how selfish she was during the wedding rehearsal.
'I was too cruel to Twilight, while she needed me most I had abandoned her and now she is possessed by dark magic because of me! If what's happen to Twilight, I'll never be able to forgive myself!' Fluttershy cried at the thought of losing Twilight forever.
Pikie Pie just sat there silently, she didn't cry or move. She just sat there, but her mane and tail were now straight and darker, she lowered her head to let her mane cover her face and her mouth muttered something like "it's all the fault of me".
Spike was staring at Twilight's new form, he was so shocked and couldn't think of anything, he didn't know what to do and didn't want to believe what Celestia princess had just said. Twilight is pony that incubated him from the egg, the two have been together until now, he sees her as his sister and now he realizes that he is about to lose her because of a stupid mistake of him.
'Oh ... Twilight! What have i done? Once again I failed the same way I failed with Luna by giving Nightmare Moon a chance to take over her and the cost is being a lonely thousand years, I vowed never to it happened again... But now, again I failed as a mentor. Cadence is right, I am her aunt who should have known she would never behave like that even under stress. I shouldn't even get married while Canterlot is in danger... But, I will do everything to redeem my mistake! Whatever the cost, I will definitely not let you fall into darkness. I promise, Twilight!' princess Celestia thought in regret and suffering.
"Oh ... Twilight" Cadence angrily looked at innocent unicorn she was babysitter and play with Twilight when she was a filly, they read books together, play together, and times she read fairy tales before bed for Twilight. And now the innocent girl was hurt, pain and desperate. 'Twilight, I will definitely save you from any darkness that possesses you!' She thought.
And then ... BUM !!!!!!!!!!!!!!!!!!!! Twilight suddenly shoots a spell of dark gray magic at Chrysalis while she is shocked at the new shape and the terrifying power emanating from Twilight.
Before Chrysalis can stand up, Twilight quickly teleports back to Chrysalis and fires another spell of magic at her. Then a huge gray magic hand with sharp claws appeared from Twilight's horn, grabbed Chrysalis and threw her at the wall, Twilight using her new wings to fly back to Chrysalis at the speed of light, the sharp edges of Twilight wings cut into the hard chittin layer of chrysalis and a blue fluid gushed out from the wound, probably the blood of the changeling species.
Just like that Twilight used her new wings as a weapon, along with the tremendous speed and new magic that had been strengthened by her power of death, she constantly injured the changeling queen. without giving her a chance to protest. All her friends, her brother, her mentor and Cadence look at Twilight battling with fear and anxiety. They feared that Twilight would kill changeling queen, even though Chrysalis were bad, and they hated her, but the more they didn't want Twilight to become a cold-blooded murderer, they were worried that if she continued like that Twilight would be sink deeper into the darkness.
After the constant and powerful attacks of Twilight, Chrysalis finally collapsed, she could not stand up or even move because of the bleeding wounds from her, if not she was queen of changeling and she have a thick chitin shell, she probably dead now.
When changeling queen could no longer stand up, Twilight crouched to the ground and slowly approached the place where Chrysalis were lying, Twilight looked at her with cold eyes and a fearsome flow of the lord's death. her surroundings made Chrysalis contract and tremble with pain and fear.
"P... P... Please... Forgive me, you won! I will not invade Equestria anymore! It is yours! So please, don't kill me!" Chrysalis shivered begging for Twilight. Truly, if not because now she could not move because of her wounds she would be willing to kneel down and beg Twilight to forgive her.
However Twilight did not say anything and continued towards Chrysalis slowly and intimidated. Making Chrysalis even more frightened, all that chrysalis could hear now was the sound of the hooves knocking on the floor as they approached her, step by step, by Twilight as if typing. pounding at changeling queen's heart made her heart beat faster and faster with fear as Twilight approached her.
"Stop Twilight !!!!!" Main Five, Shining Armor, Cadence, princess Celestia running and standing between Twilight and Chrysalis to prevent Twilight kill changeling queen.
"Please Twilight! Listen to me, don't let the drak magic control you, it will only make you worse." Celestia princess begged Twilight to listen to her.
"That's right Twilight! you're right, she's evil and we should listen to you, but instead we let you down, we were too absorbed in preparing for the wedding and we were not listening to you and even though we have abandoned you, we are bad friends. But please don't let dark magic control you, you're not the killer" Applejack said sadly. All her other friends looked at her with pleading eyes.
"Twily ... Please ... I'm very sorry, I should listen to you, I shouldn't kick you from the wedding. I was a stupid, bad brother and ... And stupid! I don't deserve your BBBFF, but please Twily ... Don't ruin yourself ... Please!" Shining Armor begging.
"Twilight! please stop! I know you're in pain and despair, but please let me help you Twilight! ... don't do this, she's bad but doesn't deserve to die." Cadence said, trying to prevent Twilight from killing Chrysalis.
They all thought that Twilight was consumed by magic drak because of the suffering that her friends, brother and mentor had caused her. However, they did not know that the power Twilight was holding was not dark magic but it's the ultimate power of death. Now she no longer felt pain, hatred or anything. she became Death Lord who keep balances life and death. And she has no intention of killing Chrysalis, she only wants to scare Chrysalis so that she will not dare to wage war with Equestria again.