Author's Note:

Wow, we're almost at 300 viewers on this? I never really expected anyone to read these. Thank you to everyone who's reading! I'm going to try and post two chapters today if possible, so stay tuned for later tonight!

Chapter 4

Anger

"P-Papyrus! U-U-Undyne! S-Sans is… he's…" Alphys's hands were shaking as she held her phone in her hands. With her phone, she was able to watch everything her cameras saw… and what she saw scared her to her very core. Sans was killing everyone in his path, and laughing like a maniac the entire time. His eyes were a light blue color and he looked pure evil. He looked like he would kill anyone in his path, just because he wanted to. Undyne took the phone from her hands and watched in horror, as all the inhabitants of Waterfall were being slaughtered one by one. It was a complete massacre. Papyrus looked over Undyne's shoulder and caught a glimpse of what was happening… and he felt like he wanted to die. That wasn't his brother, that was something else. It had to be something, or someone else. Sans would NEVER do that, he thought.

"Has he lost his fucking mind?! First he absorbs the human soul, and now he slaughters innocent bystanders for the fun of it?!" Undyne's eyes blazed with fury as she spoke.

"Y-You two… you two go to Asgore! I-I need to activate Mettaton. I b-built him as a h-human eradication r-robot. H-He can stall Sans i-if he's coming f-for us… c-can't he?" Alphys was petrified at the sight of what happened.

"Fine, go! You don't have any time to lose. Activate him, and send him to Asgore's castle. He can't stop Sans, not on his own. We all need to work together to stop him." As soon as Undyne finished speaking, Alphys ran as fast as she could back to her lab. At the time, they had just gotten to the core. Papyrus and Undyne got into the elevator and rode up. Undyne wanted to talk to Papyrus, but she couldn't find the words for him. Once they reached the end of the elevator ride, Papyrus slowly walked outside of the elevator and completely stopped moving.

"UNDYNE… WHAT'S… HAPPENING TO HIM? WHY IS SANS… DOING THIS?"

"I don't know what's gotten into your brother, Papyrus. But he's out there killing innocent people. We have to find a way to stop him, Papyrus. Trust me, I don't like this either. But… what choice do we have?" Papyrus looked down. He couldn't look Undyne in the eye right now. As much as he knew she was right, he didn't want to believe it. He just wanted to talk to his brother. He just wanted things to go back to normal. But he didn't know if things could ever go back to normal after everything that's happened.

"Ugh, is that it for Waterfall already? How unfortunate… I guess I'll just have to settle for Hotland instead." Sans proceeded on towards Hotland, seeing as how he'd already killed all of the monsters in Waterfall. Instead of teleporting, he decided to walk there. If he met any monsters on his way, he'd be happy to destroy them. He got to the water cooler, and decided to destroy it. In case someone ever needed it… like Undyne. Oh, how angry he was at Undyne. They had threatened each other, but Sans was so much more powerful than her now. He could crush her in a matter of seconds, if he wanted to. And lord did he want to…

"Dude, like, stop right there!" As Sans continued on, he met Royal Guards 01 and 02. Pathetic, did they really think they could do anything to him?

"You two have a death wish or something?" Sans summoned two bones to his side. "Because if you two wanna die… I can help with that." The two Royal Guards raised their weapons and charged at Sans. He fired both of his bones at 01 and teleported behind the two of them. The impact of the bones stopped 01 in his tracks, immobilizing him temporarily. While 01 couldn't move, Sans used his blue magic to lift 02 off of the ground and throw him into , Sans immediately teleported above them, summoned a Gaster Blaster and fired it directly down at them. The impact of the blast disintegrated both of them instantly. "Well… they had a fair warning. Heh heh heh." Sans continued on and got to Alphys's lab. As he got inside, he saw Alphys and Mettaton talking. Mettaton had taken up a new form, one that wasn't just a box of metal and magic. He looked like a person now.

"O-Okay Mettaton, hurry to Asgore's Castle! Undyne needs you there to stop Sans!"

"I'll be there within moments, Alphys darling!" Mettaton went straight for Asgore's Castle. Alphys let out a sigh of relief, thinking that she's done to help with the situation with Sans. Suddenly, Sans used his magic and lifted Alphys into the air.

"So, you think that robot can stop me, do you?"

"S-Sans?!"

"Heh heh heh… that piece of scrap metal would get crushed in seconds. Almost as fast as you'll get crushed." Those words shook Alphys to her core. Was she really about to die? Was Sans just going to kill her, right then and there? "Let me show you something, Alphys." Sans walked to her computer and opened a message. "Do you recognize this message? It's the last message I sent to you." He brought her to the screen, and showed her a message that simply said: "I KNOW WHAT YOU DID."

"T-That… w-w-was you?!"

"Yep! I know what you did to those poor, poor monsters. Speaking of…" Sans teleported both of them down to the True Lab and smashed her against a table, then summoned a blue bone and shoved it through her head. "You know how blue attacks work, don't you? Just don't move… and you won't feel a thing!" Sans chuckled, and dug through the contents of the True Lab, and took out a vial of Determination.

"S-Sans… i-if you use that on yourself… y-y-you'll melt!"

"Oh, I know this Alphys. That's why I won't be using it on myself…" Sans teleported right next to Alphys, grabbed her arm, and injected her with the Determination. "Now, you stay right there. I'm gonna go deal with everyone else." And with that, he teleported away, out of the True Lab, and back into Alphys's lab. Meanwhile, Alphys twitched in pain as her skin started to melt from the determination. She tried to scream for help, but her words just turned into nothingness as the Determination took its effect. Within a matter of minutes, Alphys's skin had completely melted. Whenever she'd try to speak, no sound would come out of her mouth. The pain was unbearable… she couldn't take it. She moved her head up, and let the blue bone's damage take effect, as she felt the pain of a bone being shoved through her head. Not even five seconds after barely lifting her head, her head fell back down onto the table, as she met her untimely demise.

Undyne and Papyrus ran into the throne room. Asgore was there, drinking tea, as if nothing was happening. "Asgore! We need you NOW!" Undyne yelled, catching Asgore by surprise, as his tea almost slipped out of his hands.

"Ah, Undyne, welcome! Would you like a cup of tea?" Asgore asked, oblivious to what's been happening. Undyne slapped the tea out of his hands and took out Alphys's phone, and showed him recordings of what Sans has been doing the past few hours.

"Asgore. We NEED to stop him. Everyone in Snowdin and Waterfall is dead!"

"Slow down, Undyne. Explain what happened." Undyne opened her mouth, But Papyrus put his arm in front of her, wanting to explain what happened himself.

"YOUR HIGHNESS… MY BROTHER, SANS, HAS… HAS GONE INSANE. A FEW HOURS AGO, HE KILLED A HUMAN THAT FOUND THEIR WAY TO SNOWDIN FOREST. WHEN I WALKED UP TO HIM AND ASKED WHY HE DID THAT, HE RAN AWAY FROM ME. I TOLD UNDYNE WHAT HAPPENED, AND WE WENT BACK TO SNOWDIN FOREST TO RETRIEVE THE SOUL AND BRING IT TO YOU. HOWEVER, ONCE WE GOT THERE, SANS WAS THERE IN FRONT OF THE SOUL. WE TOLD HIM THAT WE WANTED THE SOUL SO WE COULD FREE EVERYONE FROM THE UNDERGROUND, AND THEN HE ABSORBED THE SOUL RIGHT IN FRONT OF US AND THREATENED TO KILL UNDYNE. I TRIED TO TALK TO SANS, BUT THEN HE FIRED A GIANT BEAM INTO THE GROUND, AND ONCE THE SMOKE CLEARED HE WAS GONE. NOW HE'S GOING AROUND KILLING EVERYTHING IN HIS PATH!" Papyrus said it all at once, surprisingly enough. Undyne looked Asgore in the eyes as she prepared herself for what she was about to say.

"Asgore. We need to use the human souls. Sans has already absorbed one. If we can take the human soul out of him, then someone can absorb the rest of the human souls, and use the power to destroy the barrier afterwards. But for now, we NEED to stop Sans." Asgore looked down, not wanting to admit that what she said was mandatory.

"In the room with the barrier… the human souls are there. Do what you wish with them." Undyne smirked slightly at the sound of his words. Once he finished speaking, they heard something coming from behind them. Undyne turned around and got her spear ready, for who she was expecting was Sans. Then, Mettaton abruptly came in to the throne room.

"Darlings! I'm afraid I have some bad news!" Undyne sighed, she was kind of excited to get a chance to fight Sans, honestly.

"Mettaton? What's wrong… and where's Alphys..?" Undyne's voice was suddenly full of worry.

"Undyne, you know of the cameras Alphys has placed around the world, don't you? Well, I have access to these cameras too. Soon after I was activated and sent away from Alphys's Lab, Sans showed up there…" Undyne's facial expression became a weird combination of anger and sorrow. Her uncovered eye burned with rage, while tears slowly fell from it. Without a word, she turned around and walked towards the barrier. She would take the souls, and make sure Sans paid for what he did. Undyne didn't care about what was justice anymore.

All Undyne wanted now was revenge.