My friends and I had to be so extra and send each other prompt requests with the prompt, the names, an element (became damn difficult with this), an AU and angsty/lighthearted.

29
Firena vs Jade
Earth
Canon
Dark

"I can't do this without you!"

Firena was on the verge of tears as she hugged Jade tighter. They were both on their knees and while his body was limp she felt like every single one of her muscles was tense. His trembling form seemed to slip further away but she held on tight. Ladybug and Chat Noir were staying behind, watching them anxiously, fearing what would happen.

"Please, please Jade, don't go, I can't-… I can't do this without you!"

He whispered something and she shook her head.

"No, don't give in, don't give in to him, please, I need you!"

Rain relentlessly poured down on them and soaked their hair and suits. He again whispered something, then something dark started bubbling on his feet.

"No Jade, no!", Firena panicked, "Don't give in, fight it! Fight it! Jade!"

The dark, bubbling magic reached his knees and then hips and he trembled even more.

"… I'm-… S-So-…", he choked before Ladybug's yo-yo wrapped around Firena's wrist and she yanked the fox-themed hero away from him.

"No, no, let me stay with him, I can still stop this, let me-...!", she fought against Ladybug's grip as her friend helped her up but stilled as she saw Jade completely being engulfed by the magic, "Jade! Jade, hear me out, fight this, fight it! I'm with you, Jade, I need you!"

Ladybug flinched as she heard a low chuckle coming from the hunched form on the ground.

"Fi, we have to get out of here and regroup. Chat's down to one paw print and I'm running on three spots.", a quick glance down on Firena's bracelet told her that her friend had less than two minutes before she detransformed, "Shit, Fi, c'mon! We have to ge-"

Before she could finish, the dark magic vanished and on Jade's place kneeled a boy who seemed to present the extreme opposite of their friend. Every dark green part on his suit had been replaced with a light red, every lighter green or yellow part was now a shade of violet. He stood up and chuckled lowly, his mask having merged from a round shape to the signature butterfly. But his eyes were the worst part. While they had remained the same in the normal Jade Turtle suit, like Ladybug's, they now held the exact opposites. His eyes were pitch black and the iris was of a swirling and sharp turquoise color.

"Well hello there…", he chuckled, taking the light red shield from his back, "Look who we have here."

Firena swallowed thickly, and shrugged Ladybug's hands off, not caring about the rain that still drenched them to their bones.

"Jade… Jade, please… Y-You're in there, I know it…"

The Akuma laughed and tossed his shield in the air to catch it with his other hand, then he smirked.

"Who's Jade? Interesting name. But, you know, mine's even more interesting. I'm Red Diamond, nice to meet you.", he smirked and patted the shield, "Hard as a diamond, get it?"

Firena clenched her teeth and bit back a sob.
"Jade, please come back to us, I can't do this without you."

He just smirked and got into a fighting stance.

"Exactly. There are always two required for a good fight and looks like I got the jackpot.", he grinned as he let his eyes wander over the three heroes, "And now let's dance. I suppose you know the drill already."

With that, Red Diamond leapt at Firena.