Let's go, baby! Also, feel free to criticize, be harsh as much as you want, and I'll try to improve.

-In a Forest Somewhere Near the Mansion-

No POV

Y/N and Lacina stared for a second, then a sword hits Subaru's back shoulder, luckily not hitting anything vital. The swords that were lodged on the rock wall behind them got unstuck and aimed towards the 2 people. All of it launched towards them, Y/N luckily managed to grab Subaru and made a run for it. They stopped when they encountered a dead end.

Y/N avoided a flying sword that was coming towards him and deflected more of the swords incoming with a flash. He looked at Subaru, who managed to get the sword out and was hiding behind a huge rock

"Subaru! Go somewhere as far as you can!" Y/N said

"No, I want to help too!" Subaru said as he narrowly dodges an incoming sword, grazing his cheek "Shit! That almost got me!"

"That's why I told you to run! This fight is not on your level, you're too weak! Let me handle this!"

"Fine! But you better come back alive!" Subaru ran into the woods, hiding from the shadows.

"I should be the one to tell you that!" Y/N yelled back to Subaru and looked where the swords are coming from, just to see Lacina launch 3 more swords towards him. Y/N deflected it and dashed towards her. She opened up small portals at the size of a dinner plate, then a sword of all shapes and sizes came out, launching towards Y/N.

"You've got to be fucking kidding me! I've had enough shit from Giglame-" Y/N got interrupted as he got knocked away by a morning star, and smashed into a tree, piercing through it and getting stuck on another tree "What the f-" He, once again, got interrupted as multiple swords almost pierced him.

"Alright, one time is funny, three times is just getting fucking annoying" Y/N said as Rem appeared beside Lacina. Y/N managed to get himself out of the tree.

"How did you miss?" Rem asked at Lacina.

"We-" Y/N dashed towards them, Rem threw the morning star towards Y/N, but it missed and he grabbed the chains and used it to pull Rem towards him. Y/N sliced her arm, and Rem tumbled around.

"Well? How does it feel to get interrupted, huh huh?!" Y/N yelled at Lacina "And you're overrated!" He yelled at the blue-haired maid, who was holding her bleeding arm. Lacina glared at Y/N, she summoned a fuck ton of swords at the sky. Y/N widened his eyes then grinned.

The swords rained upon Y/N. But as the swords were in his range, he held his hand out at the swords, which stopped moving due to Y/N's telekinetic powers. The swords turned towards Lacina, who widened her eyes.

"You're fucking stupid to think that'll kill me. It's pretty much basic knowledge" Y/N was about to launch the swords back to Lacina, but Rem rammed her body to Y/N's back, losing his control to the swords. The swords fall to the ground.

"You motherfucker" He said as he got up and glared down at Rem, who was bleeding "I should've aimed for the head" Y/N kicked Rem on the head. Lacina, enraged, grabbed one of the swords and tried to stab Y/N while he was distracted. Y/N saw her reflection on a sword that was stuck on the ground, he quickly turned around and dodged the stab. Y/N tried to stab her neck, but Rem grabbed his hand, and Lacina managed to stab Y/N on the shoulder.

'Why didn't you just make them explode? They have mana' Alternate said inside of his head as Y/N kicked Rem away.

'Where's the fun in that?' He thought as he grinned.

Rem grabbed her weapon and flung it to Y/N, who ducked and rolled out of the way from the incoming swords. Rem continued her assault with Y/N, with Lacina supporting her with her swords. Y/N is getting tired of all of the dodging, he was about to turn red, but Rem tripped in a small piece of rock. Y/N saw the opportunity and was about to Slash her.

"El Fura!" But a small burst of sharp wind dismembered the arm holding the weapon and throwing Y/N very far away.

"Ack!" Y/N said as his body collided against the rock wall. Y/N coughed out some blood and wiped his mouth "Every fucking time!" He complained "Alright, time to get a little bit serious" Y/N cracked his neck and turned slightly red, with his wounds healing.

Back at the Trio, Lacina gathered all of the swords and pointed towards where Y/N was thrown away. Ram tended to her sister, who was clenching her injured arm.

"Are you alright, Rem?" Asked Ram.

"I-I'm alright, sister" Rem said as she healed herself, the wounds inflicted slowly regenerated. As she was fully recovered, Rem stood up and readied herself.

A blur ran past both Rem and Ram, their eyes widened and turned towards Lacina, who didn't know what was going on until Y/N grabbed her head and bashed it into the tree. Breaking her skull and ending her life.

The sisters widened their eyes, it was so sudden. Rem's forehead started glowing and a small horn materialized. Ram grabbed the wand from her pocket and pointed it towards Y/N.

"You've got a power-up too? Awesome!" Y/N said as he dashed and grabbed his katana laying on the ground, which was next to his dismembered arm. Rem swung her long weapon, Ram just stood back at the sidelines, shouting spells like a little bitch. Y/N avoided the spells and attacks and targeted Ram, who kept backing away while firing her spells.

Y/N dodged Rem's attacks and sliced off her arm. Rem screamed in pain and fell to the ground, Ram watched in horror as Y/N stopped running and casually walked towards her.

"Ul Fu-" Y/N held Ram to the throat, he grabbed the wand and threw it away. Ram struggled to escape from his grasp, Y/N smirked at her futile attempts.

"You were worth every cent, truly you were. I don't know what that means, but it sounded very cool" He said as he quoted a certain ginger with a bowler hat. Y/N sensed that Rem got back up and will swing her weapon at Y/N, so he pretended that he didn't know and kept strangling Ram.

As Rem swung her weapon with all of her might, Y/N turned around and used Ram as a shield. The morning star struck Ram with her head, crushing the skull and brain matter flying everywhere.

"Woah! I knew that would be a strong attack, but I didn't know it was going to be THAT strong" Y/N said as he tossed Ram's twitching body to the side. Rem stared in horror and kneeled, tears flowing through the eyes.

"You really thought all of you could defeat me? Bitch, this isn't even my final phase!" Y/N laughed, at Rem, who was still crying over her sister. Y/N stood behind her and looked at her with interest but now replaced with boredom "Alright, this is getting too boring, goodnight" Y/N said, as he raised his katana in the air. But an ice shard knocked the weapon away from his hand.

"Oh for fucks sake, what now?" He asked himself, he turned around to the person who did it, which was nobody else other than Emilia herself, with Roswaal to her side too "Why is everyone appearing here all of the sudden? Are we having a reunion?"

"Why are you doing this all of a sudden, Y/N?" Asked Emilia with a hint of sadness.

"Why? 'Cuz your maid attacked Subaru without any reason!"

"T-They did?" Emilia asked in shock. Roswaal took a step forward, Y/N readied his Katana. Y/N felt Roswaal's power spiking through the roof, he shouldn't underestimate the man.

"I am quite mad by the deaths of my maids, Y/N-Kun" Orbs of random colors manifested around Roswaal, he smiled to Y/N with closed eyes, making him more intimidating a little bit "Are you ready to face the consequences?"

"Bring it on!" Y/N said as he dashed towards Roswaal, Roswaal wasted no time and used his strong spells.

"Shamak! Dona!" He said as Y/N got blinded, he stopped running and slashed everywhere, hitting nobody.

"I can't see shit!" He said as a rock wall appeared behind him, covering Rem with what's about to happen.

"Al Goa!" Roswaal lets loose a massive inferno and headed towards Y/N, Y/N felt the warmth and assumed the worse

"...Fuck" Y/N muttered. As Y/N was about to get hit by the fire spell, a green aura surrounded him and threw him away, avoiding the very hot flames "Whoever did that, I could survive that! I am immune to fire if you may not know it!"

"You owe me another favor" He said as someone with a long staff stood behind him.

"...Rubick, you are a piece of shit"

I may or may not have rushed the end part, maybe.