At the wedding hall

jaws of all ponies in the room fell because Twilight just said an army of changeling was weak and defeated them all alone without any effort. But at the same time all ponies except Cadence in the room, bowed their heads in shame when Twilight called them traitors. They recalled the way they didn't trust her when she said Cadence was evil and left her alone in the ballroom to comfort the fake Cadence who had treated them poorly.
"Why don't you join me Twilight? Together we can rule over Equestria !! " Chrysalis said with Twilight.
"And why must I help you? I have never been interested in ruling Equestria," Twilight said.
"So are you not interested in taking revenge on your Celestia princess, your friends and your brother? Think about what they did to you at the wedding rehearsal, they betrayed you and abandoned you! Do you not want to take revenge on them?" Chrysalis reminds Twilight about her friends, her mentors, and her brothers of how they betrayed and abandoned her. Now that guilt has deepened their minds.
Cadence was puzzled by not understanding what Chrysalis had said and turned to ask her husband "what happened while I was locked up in the cave? What have you done?".
But there was no answer. She turned to her aunt and Twilight friends in search of answers, but once again all she received was silence.
"Hahaha! If you want to know what happened, then I will tell you. They all betrayed Twilight. At the wedding rehearsal, after Twilight ran in and accused me of being bad, I pretended to cry and ran outside, then Shining Armor said I behaved badly because of stress and he kicked his sister out of the wedding. Those! who are supposed to be friends and even powerful sun princess like Celestia also leave her to comfort me. Hahaha, with friends like that, who needs enemies?" Chrysalis recounted.
Cadence gasped at what Chrysalis just said, she turned to look into her husband's eyes and asked, "Is it true Shining? Did you really kick Twilight out of the wedding? Give me my answer Shining! " She seriously asked her husband to answer.
"Yes" Shining faintly answered
"How could you !? How can you kick her out of our wedding !!! That is your sister !!! She is your flesh and blood !!! How can you do that!!! How can you all treat her like that. auntie! You is pony who has taken care of her since she was a filly, you are her mentor! Is there a mentor who is ignoring her students !? And you guys! You are her friends, how can you leave her face to comfort a pony you only met one day!?" Cadence screamed angrily at what Twiling's brother, friend, Celestia did with Twilight.
"We didn't know that Cadence was fake! We thought you were just stressed out and she was overreacting," Rainbow Dash tried to explain
"And that is the reason to abandon her!?" retorted Cadence. Makes Rainbow Dash silent because she knows Cadence is right. They shouldn't abandon Twilight even if she's overreacting. They are her friends, what kind of friends would you abandon your friends? She stamped her feet angry with her for acting so stupid.
"Aunt! You know that even if I'm stressed, I'd rather lock myself in my room than hurt any pony! And you know that Twilight won't act like that without a reason!" Cadence continued speaking to Celestia.
Celestia didn't know what to say, she knew that as a Cadence aunt she knew that Cadence would never act like that even under stress.
All Twilight's friends, brothers, and mentors bowed in shame and felt guilty after dealing with Twilight like that.
"Hahaha! You see already. Follow me, together we will occupy Equestria and report t-…" Chrysalis could not finish the sentence before a blast of dark gray magic shot at her and knocked her into the wall behind.
All ponies in the room were surprised when Twilight suddenly attacked Chrysalis.
"Who told you I wanted to take revenge on those traitors. I never thought of taking revenge on them, or rather I don't want to do anything with them anymore. Our relationship has ended since they abandoned me in that room," Twilight said coldly.
Every Twilight word like knives stabbed into heart of every pony in this room. they had been angry with her when she accused her of Cadence before, but they never wanted to end relationship with her.
"S ... so why did you save them?" Chrysalis had difficulty asking because of the injury after the stroke.
"I did not save them. I just came here to help Cadence to save Equestria" Twilight said coldly, slowly moving toward Chrysalis with dark gray glowing horns preparing to attack Chrysalis again.
Now all ponies in the room pay attention to her magical colors and Twilight's unusual eyes.
"Since when did Twilight's magic light turn into a dark gray?" Applejack asked.
"And her eyes too. It was purple in the past but now it is blue ice colored and it looks like it is glowing. Those eyes make me shudder," Rarity added.
"Her magic has changed since I met her again in the cave. As for her eyes, I swear it was gray when I saw it in the cave, I don't know why it's change to blue icy color." Cadence said while she and Shining Armor headed towards the group of Celestia and Twilight's friends.
"And I do not remember that my students have such good fighting skills that she can defeat an entire army of changeling alone. I guess she probably had some new power in the crystal cave," said Celestia.
"But what kind of power, is it dangerous?" Shining Armor asked.
"I'm afraid I don't know either. I didn't even know there was a crystal cave below Canterlot. We can only hope it's not a dark magic." Celestia said in hope.
Meanwhile, the queen of changeling stood up, saying, "If you don't follow me, you have to disappear!"
with that statement Chrysalis shoots a green magic spell at Twilight, Twilight immediately dodges to the side and shoots back, Chrysalis shoots another spell and when the spells touches it explodes, smoke and dust all over the room.
Chrysalis took advantage of the opportunity to soar above Twilight and fire off another magical spell. However, now with the death god eyes it was easy to see everything clearly and quickly dodged and fired another magic spell at Chrysalis, but queen dodged to the side.
"Hahaha !! You may have an advantage when I am on the ground, but now I am up here and you are not! You can't beat me Twilight Sparkle," Chrysalis mocked.
"Think again, bugs" Twilight said.
Twilight said as she came out of the smoke ... All ponies were shocked at the new Twilight's appearance.
Twilight is now as tall as Cadence, with black armor covering her, on her back grew sharp and pointed black bony wings, and her mane and tail sparkled like princess Luna except it was dark gray and instead of stars it was galaxies, twin her eyes are still icy blue, her horns are now pointed, sharp, and curved, it's a lighter gray than her mane and tail, hair on her body is the same color as hers, and importantly her cutie mark is no longer a six-pointed star with small stars around it, but a dark gray scythe instead.