Lucas
Rarity would of been in a new realm with her standing in the middle of a giant glass pillar looking beaten up and her clothes torn from the Olympus fight. Her eyes covered by her hair as Rarity's body shook barely keeping up her standing position.

"After... All that work... I still... Feel like... I can never... Compare... To... Louis and Rainbow..."

Rarity said weakly as her consciousness was fading within the realm, but something was keeping from falling down and knocking herself out oddly.

"But... Something... Is... Preventing me... From giving... Up..."
Mammie
"**Hey there... Nice place you got here.**" 

A familiar voice would call out to Rarity and Hades himself appeared with a snap of his fingers, walking closer to Rarity and looking around at the place. 

"**But it seems like you took quite the fall from that hit from Tifa. You don't want to give up and disappoint Twilight and the other one... Or that Louis fellow right? I have *Just* The thing to help with that...**"
Lucas
"Really...? You think i... Can still be able to... Continue fighting...?"

Rarity was slowly starting to recover, as her legs stopped shaking to show she was willing to not give up. That was when odd footsteps occurred on the glass pillar platform.
Melvin
"Of course your able to continue fighting, you never given up you idiot!!"

The figure looked like Rarity, only her outfit was entirely different than the Rarity Hades saw next to him. That was also when Nightmare Rarity looked at Hades with a serious expression.

"So you have a thing to help this nitwit and her two chumpy friends... Tell you what, you and myself can help the three out as the three of us's little secret from Xion i think and that pathetic Twilight Sparkle but i know well enough you have a catch to this deal... So if there is a task your giving her, we will think about it and see if it is acceptable to do the task..."

Nightmare Rarity said with a serious tone in her voice, but gave a odd wink to him as she was willing to help in secret unlike her normal state next to Hades.
Lucas
"M-My nightmare self... You actually care about us after all..."

Rarity said as her eyes were now visible with small tears in her eyes, seeing her old evil side had changed a bit from when Nightmare Rarity took control of Rarity's body.
Mammie
"**Definitely... All you gotta do is let ol' Hades help you out a little and-**" 

Hades would say and then recoiled at seeing Nightmare Rarity appear out of seemingly nowhere and began to speak, seemingly in his favor. Random things *Do* Line up to your advantage sometimes. 

"**A catch? No, no... Just that help is a two way street. I help you, you help me and we're all a big ol' happy family or whatever...**" 

He raised an eyebrow at the wink and decided to keep that in his memory for later. 

"**Anyway... I'll just take an I.O.U. For now and come collect at a later date. I can't get you all wrapped up in my main affairs...**" 

Hades then opened his hand and a rotating ball of pure darkness appeared in his hand. 

"**And relax, I'm not gonna ask for you to go kill your friends or something heartless ™️ like that. This here is little ol' me's special source of darkness I whipped up. Use it in moderation and you'll easily outclass those broads out there. Whaddya say?**"
Melvin
"A little assistance huh...? Heh... Very well... We will consider it... Given the fact i was defeated once by the fools outside here minus the Xion brat, i will eventually find a way out of here..."

She then got close to Hades and teleported behind before Nightmare Rarity whispered to him.

"And i will make sure my little host here doesnt defy me... I dont actually care for anyone she loves so ill get rid of them whenever i get the chance... The only one i really care about? The girl with us... We got a deal... So hand me the orb and i can convert it into power for her and my benefits..."

Nightmare Rarity said before politely grabbing the orb as she then began backing up from Hades's personal space and returning to Rarity.

"Look Rarity, What other choice do we have? Switch me in, and i promise to help out with the one major issue of the two girls we are fighting... Got it...?"
Lucas
Rarity nodded before placing her hands over the darkness orb, with Nightmare Rarity placing her own hands underneath the darkness orb as the duo glow with a purple outline.

"Nightmare Rarity... Thanks friend..."

Rarity then suddenly hugged her nightmare counterpart as the orb of darkness was on the duo's heart areas.
Melvin
Nightmare Rarity didnt expect this, but smirked and hugged back to see what the darkness orb would do the duo. But Nightmare Rarity frowned during the orb's process oddly where hades may not see it.
Mammie
"**Here ya go. Just give in to those rough feelings: pain, anger, rage the whole 9 yards and you'll become attuned with the darkness and gain power beyond your dreams.**" 

Hades would say and hand over the orb to the two girls and let them do their thing. The orb would begin to leak darkness like a heavy smoke cloud, filling the area. The white glass of the pillar would be slowly turn black and the eyes of Rarity and Nightmare Rarity that was eteched into the ground would also turn into a shining gold. 

"**Now then... Don't fall to deep into the abyss and... Wake up!**"

He would let out a small laugh and snap his fingers, vanishing from Rarity's inner world and she herself would slowly feel herself wake up in the real world.
Melvin
"Heh... Good luck you fashion designer... Dont you dare give up on me...!!"

Nightmare Rarity called as she laughed evily as she vanished from the hug.
Lucas
"The anger inside me... I WON'T GIVE UP AND I **WILL** BE STRONGER THAN LOUIS AND RAINBOW DASH!!!"

Rarity yelled in anger, not allowing herself to be consumed by the abyss and darkness as she woke up back in the real world.