Your POV
I fired a beam towards Schatten, a huge explosion occurred shortly right after. He couldn't have dodged that one.
"That was strong I admit." Schatten said walking out of the smoke that built up "You blew off my arm, but that's no problem."
His arm regenerated from a shadow.
"As long as there is light, there will always be darkness." he laughed out loudly.
He fired a bunch of shadows towards me and I tried to block them, only to get thrown back.
"NGAAAAH!"
A bunch of spears were thrown at Schatten and he was impaled by them.
"You alright (Y/N)?" asked Undyne as she gave me a hand.
"Yeah.. I think you got him..what?!" my heart dropped when I saw Schatten walking out of the spears like it was nothing.
"You two really are something." he said removing the spears from his body. "But.. it's going to take more than that to kill me.
"How do we beat this guy.." I said to myself "This guy is a literally a shadow."
As he removed the last spear that impaled his chest, his soul came out. It was a shade of red and black, almost like it was corrupted.
"Yes, this is my soul. The soul of Corruption." he said placing it back in him. "Your soul (Y/N), I will corrupt it too and make it as my own."
His arm was covered in black shadows and he struck my chest grabbing my soul. I couldn't move, I could only see my soul being corrupted.
"GAAAH, LET GO OF ME." I struggled.
"It's no use, soon your soul will be mine." he laughed.
I could feel myself losing grip of reality and slowly blacking out.
Unydne's POV
"(Y/N)!"
He was fast, neither (Y/N) or I could react on time. Schatten released (Y/N), but his soul was being over powered by corruption. I need to help him, no wait. I need to get him out of here and find a way to stop his soul from corrupting.
"I need to get him out of here!" I said running towards him.
A shadow blast struck right in front of me and jumped back dodging it.
"Not so fast armored sushi platter." Schatten walked towards me. "You're not going anywhere with that specimen."
"Specimen?" I asked "You work for someone don't you?"
"That is none of your concern, but you should be concerned about your life right now." he snickered.
He rushed towards me with a shadow spear and I block it with my own.
"I made a spear myself to keep this fight fair." he mocked "Although compared to yours mine is still way stronger."
"For a person who works for someone else, you sure are cocky." I pushed him back.
"Oh don't worry after I get (Y/N) soul I'll destroy the organization that created me." he attacked back.
We both clashed and dodged each others attack, creating craters and leaving the terrain around us broken to pieces.
"You're not bad, Commander." he complemented me.
"You too," I said creating more spears "But pleasantries have to wait."
I threw all of my spears at him pinning him against the ground.
"I'd finish you off, but I need to save my friend."
I ran towards (Y/N) and picked him up, I ran as fast as I could towards base and didn't run fast enough. I only got there in less than 5 minutes.
"Alphys!" I called for her.
"H-Hey Undyne w-what is it?" she asked worried.
"(Y/N) needs help." I placed him down on a bed. "Get him to the emergency room, I'll gather up everyone else."
"A-Alright, b-but how where did you get the transportation to get h-here quickly?" she wondered.
"I ran." I simply replied and walked towards the elevator.
"She r-ran?? But Mt. Ebott is halfway across the city..??" Alphys sweat dropped.
Your POV
"Where am I?"
I was in a white place, there was nothing in here. Am I back in the void?
"Not exactly the void." a faint female voice said
"Who's there?" I asked. "Where am I?"
"You're in my timeline. The Omega Timeline." I turned around and saw Frisk, but.. she was gray and had no eyes..?
"F-Frisk..?" I backed away a bit quickly.
"Yes I'm Frisk, but not the Frisk you know." she explained.
"I'm Core!Frisk, I can see all timelines. I guess you could say I oversee all timelines." she giggled.
"How did I get here Core!Frisk?" I asked a bit confused.
"How you got here, I brought you here." she motioned me to follow her.
"Your timeline is in grave danger and so are you." she said a bit serious.
"You or Schatten don't exist in other timelines, which makes you two very special. But Schatten is an embodiment of corruption which has been a problem ever since he came into existence." she showed me Schatten who was removing spears from his arms, he was heading towards base.
"He corrupted your soul and only you can stop it from completely taking over." she pointed at me.
"Me? But how?" I asked "How can I stop my soul being corrupted or Schatten in general?"
"You can and you must," Core!Frisk smiled "For only you can stop him, you are the embodiment of order."
"My soul is the soul of order..?" I asked a bit shocked.
"Yes (Y/N), you are the embodiment or order." Core!Frisk explained. "I know it's a lot to take in, but I will explain everything."
A/N: Done with a new chapter.