Undersplice

Genocide

Frisk walked through waterfall alone. They had come back after dealing with Alphys. They wanted to make sure they didn't forget anything... Or anyone.
Frisk walked past slowly. Hearing quiet crackles and whimpering. Frisk stopped and turned. Seeing a pale flame dim as they approached. Frisk walked over to find a tiny Sprite. They jumped as Frisk grabbed their shoulder. "Hey there." Frisk whispered. The little flame began to cry magma as Frisk smiled.
"You killed everyone. They're all gone."
Frisk nodded and smiled again. The tiny Sprite shrunk a little more as Frisk picked them up. "You're here alone?" Frisk asked sweetly. The Sprite shivered and nodded slowly. "I see." Frisk thought for a second.
"You're not going to hurt me?" The little flame asked as Frisk brought them away from behind the rock they had hidden them self behind. Holding them like a child.
"Of course not." Frisk said walking. The little flame sneezed relieved and closed their eyes. "My name is wisp." They whimpered. Frisk chuckled and turned off the path to the bank near the stream.
"Your name should be mud." Frisk said happily. Wisp looked at the human confused and began to shrink again. "Why?" They asked fearfully. Frisk held the tiny flame up and smiled. "Because that's what you're gonna be!" Frisk laughed and Wisp screamed as they realized Frisk had them held over the river. "Please spare me!" Wisp pleaded. Frisk shook their head and dropped the flame into the water. Wisp cried in pain for a while. Trying to grab the bank only for Frisk to step on their hands. Eventually the screaming stopped and nothing was left of wisp besides a charcoal version of them floating lifeless in the water. Their sweater hanging loosely to their arms.
Frisk clutched the cash they had taken from Wisp while carrying them.
Frisk nodded and walked back towards the lab. Hoping they were ready to face Sans and the king.
As Frisk approached the lab they could hear obnoxious banging and yelling. Degree rammed at the door with Zombie in her arms.
"Alphys open the door! Sans and Zombie got into a fight about something that happened with Papyrus! And now everyone is gone! Alphys please open the door!"
Frisk walked up hesitantly and held out their knife. Degree stopped banging the door as a small bit of light glinted off the blade into her eye.
"You..." Degree stuttered while turning around. "Me." Frisk chuckled. Degree gently wrapped Zombie in her tail and hissed. "I knew this might be the case." She whispered. Frisk nodded and smiled. Degree growled and slashed out at Frisk angrily. Saliva foaming around her lips as she strikes.
Frisk dodged and went to slice Degree on the arm. Degree stepped aside and hissed heavily. "Don't try me kid. Put the knife down." Frisk shook their head and winked as Degree charged them. Biting at their sweater and falling on her face. "Hold still you evil thing!" Degree scolded while checking to make sure Zombie hadn't hit her head and cracked it more. Frisk took this distraction kindly and plunged their knife into Degree's side.
Degree gasped for air as Frisk twisted the knife further in. Pulling it out again only to stab Degree in the stomach.
"There." Frisk chuckled as Degree held the bleeding wounds. Her body beginning to melt.
"think you can... Kill me that easily?"
Degree huffed while clutching tighter to Zombie. Her body melted a bit more and she reformed.
"Now you see why I'm the best brawler." Degree snickered while showing off her four arms. Her feathers melted and stretching into a gorgeous mane over her chest.
Frisk sneered and wiped their blade clean.
"If I can kill Undyne twice, I can kill you twice." They said determined.
Degree roared and the earth shook.
Frisk stumbled backwards and fell on their butt. "Cmon skin sack, fight me now." Degree laughed while thwacking Frisk to the side. Throwing Frisk about and biting them several times.
Frisk was growing weak but found a weak spot on Degree. Her face. Frisk waited for Degree to lift them high up, then stabbed her in the eye. Degree screeched as blood gushed from the wound. Frisk pulled the knife free and stabbed Degree in the frontal lobe. Degree stopped moving and fell to the ground. Frisk smiled and pulled the Knife loose again. Stamping on Degree's snout in order for it to break free.
Degree let out one last huff before fading to dust. Her soul vanishing.
Frisk looked down and picked up a tooth left behind from Degree's jaws. Frisk shoved it in their pocket and looked to Zombie. Her almost lifeless body splayed on the ground after Degree had dropped her. Frisk looked around in hopes to find some sort of cash. But there was nothing. Frisk remembered the house in the forest and snickered evilly. Zombie mumbled and shivered. Pink slime sputtering from her teeth. "You're going to die slowly. You should be gone when I return." Frisk said while stepping on Zombie's head. Letting it crack ever so slightly more.
Frisk raced through the underground and came to Zombie and Degree's house. Finding no money and nothing of extreme value besides the sword in the closet. Frisk took it in hope it would come in handy. Frisk took a bit of the leftovers in the fridge and left. Wandering back through the underground more slowly.
Frisk took a day in order to return to where Degree had been slain.
Frisk looked about but could find no ashes where Zombie was laying. Only finding a puffy jumper. Frisk shrugged assuming Zombie had simply blown off the edge after dying.
Frisk walked through the lab an to the true lab swiftly. Crawling through the empty hole of memories.
Frisk didn't think much on the echoing sounds until they grew into what sounded like footsteps. Frisk turned around and chuckled as the darkness swallowed them whole.
"You have fun?" A voice echoed weakly. Frisk nodded and hoisted Degree's sword above their head. "I thought you wouldn't make it." Frisk whispered. Zombie appeared before Frisk. "Neither did I." She sighed. Her skull was badly battered and bruised. Open on one side with a crack streaking down her left eye.
"Let's end this frisk." Zombie growled while lifting up her hands. Pale purple hands appearing off them.
"You're sick." Zombie said while reaching for Frisk's soul. "And yet you're the one who seems to need medicine." Frisk replied while dodging Zombie's attack.
Zombie cocked her head and an array of bones spread across the ground. Many of them threatening to hit Frisk but being dodged just barely.
"Heard you got in a fight." Frisk made conversation. Zombie scratched at her arm. She was wearing Degree's tank top.
"Sans and I were talking about what to do with you. I said I wanted to deal with you and he had a fit. Maybe a bit more than a fit." Zombie said while swinging her hands to Frisk, batting them away. Frisk snickered and backed away to the darkness.
"You can't hide from me. I'll find you and you'll die." Zombie said calmly. Frisk appeared behind Zombie and attempted to strike. Zombie dodged. "Sorry, I won't let you." She said while setting off another attack. Frisk threw Degree's sword at Zombie but it was sent away with ease. "You'll have to try harder than that." Zombie said while letting the suppressed emotion inside herself out in another over fuelled attack. Several bones and pencils being shot off in directions unknown.
Zombie cornered Frisk and sighed. "Why can't you just stop this?" Frisk hissed as they were held back by Zombie's large hands.
"I don't like killing things but your death should be justified." Zombie said while holding an attack above prepared to hit Frisk with full force. Frisk looked away smiling as Zombie clenched her body. "Well..." She quivered while putting Frisk down. "This is... New." Zombie ached and felt her back. Her own attacks had come back down from the ceiling and hit her. "You can laugh." Zombie sighed while kneeling down. Frisk smiled and walked over to Zombie. Pulling out Degree's tooth and hooking her eye socket with it. Prying at her head until it shattered.
Zombie fell to the ground, her body turning to dust immediately. Her soul resisting for a second before fading away.
Frisk smiled and reached down into the ashes to find one of Zombie's pencils. Frisk shoved it in their pocket and laughed before skipping off into the darkness.

Zombie jolted awake yelling. Her head aching and her body clenched tight.
"Hey woah what's going on?!" Degree asked while Zombie cried. Degree grabbed Zombie's face and wiped off the tears. "Shhh... Calm down. It was just a dream." Zombie opened her eyes and looked around. "We're at home?" She sniffled. Degree nodded confused.
"We're home." Degree said. Zombie sniffled and cried. Leaving tears on Degree's skin.
"It was just a dream." Degree held Zombie before heading back to sleep.