A/N: This is an AU I created a little while ago. Chara takes over the Underground and it's a fight for survival every day. Now, Mercy isn't an option. The main characters of this AU are Frisk, Sans, Undyne, Grillby, Chara, and Asriel.
I don't own undertale. It belongs to Toby Fox.
Chapter one
"Frisk dear! It's time to wake up!" Toriel smiled, gently knocking on the child's bedroom door. She let out a small giggle to the sound of shuffling feet as the human child got out of bed.
"Mmmorning Toriel." She muttered, rubbing her eyes. Frisk's hair was messy, but she was brushing it down as she walked out.
"Breakfast is ready." Toriel smiled as they walked towards the kitchen. They froze; the sound of a door opening caught their attention.
"Toriel?" Frisk asked, tugging on the old monster's sleeve. "What was that?"
"I-I'm not sure. Stay here. I'll be right back."
Frisk watched as her mother disappeared into the basement, waiting closely for her to return, so that they could have breakfast.
"AAAAAHHH!"
Frisk jumped at the sudden scream. She ran to the kitchen and grabbed a knife, running downstairs to investigate.
"Too easy." A male voice chuckled. Frisk peeked around the corner, watching him seal a monster soul into a jar. A pile of dust sat at his feet.
"No…" Frisk whispered, her voice catching in her throat. Her hand shook, causing her to drop the knife with a loud clang.
"Huh?"
"NOOOOOOO!" Blinded by rage, Frisk lunged forwards, driving her fist straight into Chara's eye. She winced as she felt his flesh give way, blood running down his face.
"Ah! You BITCH!" Chara screamed, clutching his face in agony. Frisk was stunned. She hadn't meant to do that. Chara glared at her with his good eye, a red flash in his iris as he spawned a red knife. He slashed across her face, sending her stumbling backwards in shock. She tripped and fell on her back, as Chara slowly approached. He scattered the knife and spawned a larger one, stabbing her in the stomach.
"AAAH!"
Chara smirked as she slowly slipped into unconsciousness.
Sans was walking to his post for his sentry duty. It was the only thing that kept his mind off of Papyrus. His hood was up, covering his head and face. He zoned out, but snapped back into reality when he heard a scream coming from the Ruins. He teleported as close as he could, but due to the magic seal Toriel put on the Ruins entrance, he couldn't get much closer than 30ft. His teleportation turned into a sprint, hoping to get there in time. He got there and found the normally sealed door wide open. With a deep breath he ran inside. He came to a halt, finding a human girl bleeding on the ground. Right in front of his foot was a pile of dust. He looked up and saw Chara's cape flutter around the corner.
"No…" He choked, leaning against the wall. "No no no no no no no no…" He took a deep breath, trying to calm down. He forced the tears in his eye sockets to stay down. With trembling hands, he ran over to the dying girl. "Hang in there kid." He gently craddled her in his arms, using green magic to the best of his ability so he could restore her hp. She let out a quiet moan, and Sans gasped. "Shit, can't let her see me. She'll freak out." He gently lied her back down and left, running after Chara.
"Uh…" Frisk moaned, slowly regaining conciousness. She gasped, her eyes snapping open as she sat up quickly. She glanced around the room. "Strange. I could have sworn I heard someone in here." She muttered, clutching her head.
Sans followed Chara all the way through the Ruins, being careful not to get spotted by the young king.
"Chara?" A squeaky voice asked, with a slight whimper in it's tone. Sans peaked around the corner, his eye sockets widening with shock.
It was a talking flower. Not like the echo flowers, it had free will. It was talking on it's own regard. It was…
Unsettling.
"Hello brother." Chara smiled, acting as though things were completely normal.
"Oh stop!" The flower snapped. "Don't sit there and pretend I don't know what you've done. You killed our father, slaughtered hundreds of monsters, stole the throne and stole our own father's soul!" It glared at Chara, disgusted by his actions.
"You know, it's actually funny you mention that." Chara smiled, pulling out a jar. The jar had a soul in it. Toriel's soul.
A faint white glow spread across the flower's face as he realized what it was and what Chara wanted.
He wanted him.
"What? No! I'm not joining you you're a monster!"
"Perhaps I wasn't clear about your options." Chara snapped, his smile completely vanished. "You can join me, or I could teach you a few gardening tricks." He warned, spawning a large knife, pointing it at the flower. "Pick Asriel."
"Mmmm…" Asriel trailed off, looking far to uncomfortable. There wasn't really a choice given to him. "Okay…"
"Good." Chara smiled, opening the jar. Asriel extended a vine out to receive the soul, and a blinding white light filled the room. Sans had to cover his eyes, but Chara was completely fine. When the light faded, the small yellow flower was replaced with a young goat boy.
"Good. It worked." Chara smiled, but he didn't seem all too interested in the boy.
"This isn't good." Sans whispered, before turning the other way and running out of the Ruins.
The cold sear of Snowdin forest met his face as he stepped outside. Sans wasn't fazed at all, he was used to it. Besides, being a skeleton meant he didn't feel much anyways. He glanced up, noticing a dark silhouette down the path ahead. It wasn't a monster he recognized, and it wasn't the king. He approached cautiously, not wanting to scare them, and not wanting to put himself in unnecessary danger. He heard a loud crack under his foot and jumped, teleporting behind a tree.
"Huh?" The silhouette paused, looking in Sans' direction. He hesitated to make any movements, until the sound of footsteps echoed through the cave, away from Sans.
"Phew…" He sighed, returning to the path. The silhouette grew closer, so he decided to make his presence known.
"Hey there. Don't you know how to greet a new pal? Turn around, and shake my-"
"Ah!" The person gasped, whipping her head around.
"Y-you!" Sans gasped, taking a step back. The girl tilted her head in confusion.
"Um… yes. Do I know you?"
"Uh, no…" Sans chuckled nervously. "The name's Sans. Sans the skeleton."
"Frisk." Frisk smiled, shaking his hand.
"So Frisk…" Sans trailed off, shoving his hands in his pockets. "What are you doing out here? Wouldn't the Ruins be safer."
"That's what my mom thought." Frisk sighed. "But apparently we were wrong."
"Your mom? Do you mean Toriel?"
"Yeah. She took me in when I fell down here. She thought I'd be safer if I stayed with her than if I left the Ruins, but look where that got us."
"Are you okay?" Sans asked.
"I'm fine, just thinking… How did you recognize me by the way?"
"I… uh saved your life." Sans explained awkwardly. "You were bleeding out, and I healed you."
"Oh…" Frisk sighed, wrapping her arms around her torso. It didn't take a genius to see something was wrong.
"Are you sure you're okay?" Sans asked, waving a hand in her face.
"Huh? Oh, yeah. I'm fine." She muttered, shivering a bit.
"Here, let's get you out of the cold." Sans smiled, offering Frisk a hand. Hesitantly, she accepted it, almost instantly feeling a warm sensation around her body. The world took form rather quickly, and she found herself standing inside some sort of tavern or bar. It was empty, aside from a single fire monster, who was clearly the only employee.
"Hello Sans." The monster greeted, washing a glass.
"Double order of fries Grillby." Sans requested, not even looking at the man.
"Is everything all right?"
"Tori's dead Grillbz." Sans sighed. "The little bastard got her."
"Would you like to-"
"No." Sans interrupted, taking a ketchup bottle from the counter before practically throwing himself into a booth off to the side of the restaurant.
"Talk… About it…" Grillby muttered, finishing his sentence.
"I'll go talk to him Mr." Frisk smiled, running after his new friend. "Sans, are you okay?"
"How are you so calm Frisk?" Sans asked, an ugly sound coming out of his throat as he growled. The ketchup bottle in his hand cracked and oozed from the tight grip he had on it. He avoided looking at her, pulling his hood over his face.
"What do you mean?"
"HOW CAN YOU BE SO CALM AFTER YOUR OWN MOTHER DIED?!" He screamed, the bottle in his hand completely shattering. A blaster started materializing over his head, out of his control, but he calmed down and it disappeared. He took deep breaths, looking over with slight alarm when Frisk remained silent.
Frisk was staring at the ground, trembling slightly as she gripped something in her hand.
"Do you really think I'm calm?" She whispered. "I watched my mother die today Sans. I almost died today. I left the Ruins, because I was determined to kill that bastard Chara. I've been trying to keep calm this entire time, oh believe me I've tried. When he killed my mom I was blinded by pure rage. Do you honestly think that after all that I would be fine? That I would be calm? If I was so calm, I wouldn't have a god damn knife in my hand, now would I?" She almost screamed the last part, stabbing a large kitchen knife into the table. Sans winced, guilt spreading over his body.
"I-I'm sorry…" He whispered. "I haven't been in the best mind set recently. My little brother was murdered last month. And things are taking a turn for the worst way too quickly. Too many monsters have died…"
"I'm sorry to hear that Sans…" Frisk sighed. She sat next to him in his booth and gave him a small hug. Sans smiled sadly at her, but before he could say anything else, a loud scream outside filled the tavern. Frisk fell out of the booth, and Sans got up quickly, running for the door.
"Wait, that sounds like-" He realized, pushing the door open.
"God DAMN IT!" A distresses monster screamed, punching a tree. It fell over, multiple other trees being taken down with it.
"Undyne!" Sans called out, grabbing her attention. "What's the matter?"
"She's gone Sans…" Undyne growled, clenching her fists. Her pupil was narrowed into a slit, she was clearly pissed.
"Who's gone?" Frisk asked, stepping towards her. Undyne glanced her eye in her direction, eye widened. Her pupil narrowed almost razor blade thin. Sans gestured for Frisk to keep her distance and she obeyed, staying near Grillby's. The fire monster stepped outside, trying to find out what all the commotion was about. Undyne took a deep breath, ready to answer her question.
"Alphys is gone. Chara got her a few days ago. I just learned this from Mettaton."
"What? No! Undyne please tell me You're kidding!" Sans pleaded, feeling tears form in his eye sockets. Undyne sighed and shook her head. "Oh god you aren't kidding… no… no! No no no no no no no no!" He started having a slight panic attack. "Not another one… First Asgore, then Papyrus, now Toriel and Alphys… We can't lose anymore."
"Sans, you need to calm down!" Undyne snapped, kneeling in front of the skeleton. "Freaking out will not bring them back."
"She's right Sans…" Frisk sighed. Undyne looked over, staring her down.
"Who the hell are you?"
"Frisk. Chara killed my mother."
"Who's your mom?"
"Toriel. She kept me in the Ruins to keep me safe from Chara, but apparently her efforts were for nothing."
"I'm so sorry."
"Don't be." Frisk sighed. She gave Undyne a slightly creepy smile. "I'm going to kill that royal pest."
"T-that won't be so easy now…" Sans stuttered, starting to calm down. "Chara has help now. He stole Tori's soul and gave it to that flower in the Ruins."
"Why is the king concerned with a stupid weed?" Undyne asked.
"From what I overheard, apparently he's prince Asriel." Sans explained. He stared down Frisk, who looked around awkwardly.
"What?"
"You want to take down this kid right?"
"More than anything." Frisk confirmed. A look of confidence on her face.
"Then count me in. He killed my brother, it's time to get payback."
"Yeah!" Undyne agreed, flashing a sharp toothy smile. "Mettaton said Alphys was gone, but he never said she was dead. If there's even that slight chance of her being alive I'm taking it!"
"Count me in too." Grillby spoke up.
"Wait, what?" Sans asked, shooting the bartender a confused look. "You aren't a fighter Grillby."
"Yes, well I'm tired of being forced to sit on the sidelines while Chara murders my friends and family."
"We all are Grillby." Frisk sighed, hugging herself a little.
"Then it's settled!" Undyne cheered. "Let's go take down Chara!"