By Europa
Faster!
Faster!
Fly faster!
If she had known earlier that Tirek was back, she'd have taken her swarm to fight him days ago! As it stood she and her swarm was making great time to Equestria. Ever since the treatise, her people were well fed. They were strong, and she was strong, beyond Luna, beyond Celestia, beyond any alicorn. And she was going to rip the stolen magic out of his body, banish him to Tartarus, and cocoon him there!
Except there was the matter of Twilight. Her infiltrators had reported over the hivemind that her beloved Twily was wielding the power of four alicorns against Tirek in a battle even then. She had to hurry if she were to make it in time.
She came across Twilight and Tirek outside of Ponyville, locked in a vicious battle. They were sneaking up on Tirek from behind as he faced Twily, a condensed ball of demon magic between his horns unleashing a fiery ray at the alicorn, who was responding with a positively blinding ray of energy. The two beam were evenly matched... but as Chrysalis and her sky-darkening swarm approached casting range, Tirek grunted and pushed his head forward.
In that one moment, his beam redoubled in strength and closed in on Twily, knocking her back, back, back, until Chrysalis couldn't see her anymore. In mid-air she pulled back into a stop, her heart pounding in her chest. Her swarm still filling in behind her, she gazed upon Tirek. The centaur then seemed to hear their buzzing wings and turned around.
"Well then, this is a surprise."
Chrysalis saw red. He had just... hurt Twilight! Was she okay? She had to be okay! She mentally directed some of her soldiers to go provide first aid to the fallen alicorn. She swore, if Twilight wasn't okay…
"I didn't expect to get to the changelings until I finished draining the zebras. Well..." His eyes shone and he opened his mouth, but that was all that her changelings afforded him. A hailstorm of emerald bolts descended upon him and, before he could drain their magic, sealed his mouth shut with slime.
With a keening cry, her entire swarm descended upon him, blasting away and thickening the slime around his mouth despite his best attempts to rip it away.
She closed her eyes as her changelings rushed past her, shaking, then opened them. Under the red haze of a bloodlust, she saw Tirek reaching to rip off the slime.
And she was going to kill him.
With a scream, she dove at him, unleashing a fireball the size of the centaur's head at the orb of demon magic between his horns. With a muffled roar the magic exploded between his head, throwing Tirek's head back as more fireballs from her subjects peppered his impossibly tough hide. She lit up her horn and began draining him, of his life, of his love for conquest, of his energy, everything but his magic. The energy drained out from him in the form of a massive green beam, which circled around her horn, spiraling lower and lower into her head.
Under the onslaught, Tirek soon gave up freeing his mouth and resolved to blast them.
Chrysalis's army had formed a shifting, buzzing tornado around him, an ever-moving wall that rained in green blasts. And inside that shell she flew circles around him, and her Imperial Guard grouped up into formations. When Tirek launched a blast out at them, they dodged and the cocoon of changelings bent away from it, like a balloon getting blasted outwards before reforming.
Ducking underneath an expanding scythe of demon magic, Chrysalis got close to him, real close, and hardened the slime. Tirek raised his fists to swipe at her, but she ducked beneath them, and channeled changeling magic into her eyes, letting them shine brilliant green. And then she looked at Tirek, and made eye contact.
He strained to close his eyes, and in response her magic pried them open. Even with so much strength and magic in him, they were eyelids, so she was able to keep them open and maintain her hypnosis spell. He bellowed and struck at her, and in response her people swarmed closer to him, distracting him and blasting him, as the sinister yellow of his eyes was ever so slowly filled with green, as the black sclera brightened to lime. His mental wards were like nothing she'd ever seen before, but slowly, over half an hour, Chrysalis wore them down and bent the mighty Tirek to her will.
"Stop fighting us," she said over the wind her army had kicked up. And he did, extinguishing his orb of magic and lowering his hands, standing there dumbly.
She... she did it. She'd won.
Flying back and ending the hypnosis in her eyes, Chrysalis called her swarm back to her, watching Tirek through the red haze. She panted in exhaustion, and smiled. "Tirek, be a dear and give back all the magic you've stolen," she shouted over the immense buzzing of changeling wings.
He looked at her blearily through shrouded eyes; green looked good on him. "Why, Your Majesty?"
"It's to take over Equestria," she 'clarified'.
"Oh." He raised his head and shook his fists in effort, then opened his mouth to the sky. A torrent of colors flew outwards, arcing through the air presumably to the ponies it'd been stolen from. Even as he did, Chrysalis watched in sinister delight as Tirek shrunk, his red skin dulled, his horns shrunk, and his muscles vanished. When it was done, he was so... feeble and frail.
With a burst of telekinesis, Queen Chrysalis snapped his neck. Finally, the rage ended and its bitter taste flowed out of her mouth.
'Your Majesty,' came a message over the hivemind. 'We've located Sparkle Princess and are administering first aid. She is stable.'
Her wicked smile turned warm. 'Excellent news, I'll be right over.' She did just that, flying over to where she'd seen Twily fall.
She winced when she arrived. Twilight was in bad shape; she was no expert on pony biology, but she was absolutely certain legs and wings weren't supposed to bend that way. When she arrived, there was a sickening series of cracks as the changelings standing over her popped the limbs back into place.
Twilight didn't respond; she was unconscious.
The last of her limbs were fixed and Chrysalis landed, pushing the other changelings aside. With a burst of magic, she put hardened slime around her legs and wings to keep them in place, then leaned down to nuzzle her. "Hey, Twi."
The alicorn's eyelids snapped open and she gasped. "Tirek - "
"Isn't going to hurt anyling ever again," she promised. "Thanks for softening him up for me, love."
She smiled. "No problem. I'm... I'm gonna go back to sleep now, alright?"
"Of course, darling."
Later that day she walked past the body of Tirek and spat on it.