Undyne didn't waste a single second as she sent a volley of spears at Chara, not even taking it easy on her first attack like she normally would have. Chara's eyes were wide as they raised their knife, using it as a makeshift shield; the problem was that they had to be precise, one wrong move, and the spear would make it through. However, their blade merely weakened Undyne's attacks, causing the magical spears to just have lower damage as it went through the blade.

Chara found ways to improvise though, turning to the sides when they could so that the spear would barely touch them, but the attacks were fast, and hard to keep up with. It didn't help that Undyne was already using her trick spears that would change their direction at the last second. Undyne hadn't been joking when she said she wouldn't take it easy on the human.

Not that it was to be unexpected. Undyne cared deeply for Alphys, and the one night she didn't spend over…was the night that Alphys had needed her. With another shriek of pure rage, Undyne sent another volley. In the back of her mind, she knew she couldn't kill them, but she would take them to their knees, begging and whimpering for mercy she would never show.

"I should toss you down into the abyss!" she screeched as she sent another spear at them. "But it would probably spit you back out!" Some of her spears were missing in her anguish, giving Chara a slight advantage, but Undyne was still managing a few decent hits, but with a hundred hit points, Chara would have to be slowly whittled down. Not that Undyne cared. The more health, the more they would suffer!

Yes, the spears were more powerful than Chara remembered. Then again, when they had fought Undyne before, she had lost Papyrus, not Alphys. This was a whole other level of grief and anger being directed at them. Not that Chara cared too much. Monsters, humans, everyone…they were all the same. They could all go die in a fire.

Chara leaned to the side, a spear narrowly missing them, cutting through the lower part of their shirt, exposing their stomach. That had been closer than what they wanted, but with their soul green, they couldn't do much. They had to wait it out, knowing it would revert back to red briefly and allow them to move around freely. It was then that they would attack, and they were counting on Undyne's emotional mindset to allow them an easy opening.

They grunted as a spear hit them, dispersing as it did so, taking a small chunk of their health as they fell backwards onto the ground as Undyne glared down at them, summoning another volley of spears. "You're going to regret ever coming here!" she yelled as the spears came crashing down.

Chara leapt to their feet, swaying this way and that. They couldn't dodge all the spears, but at least this way, some were only partially hitting them, and not damaging them so badly. Undyne was relentless however, summoning more and more spears as the human continued to dodge. She may not be out to kill, but she wouldn't be upset if she maimed them, or even paralyzed them so that they were helpless.

"You're going to suffer!" The heartbreak became evident in her voice as she attacked again, taking a bit more of Chara's health. Alphys had been a friend, and a special one at that, even if she didn't care to admit it to others, and just when things were starting to go smoothly, the human tore it away without even batting an eye at all the hurt they had caused.

Undyne didn't care what happened to her anymore, so long as she could avenge Alphys.

Alphys…she remembered when they had met.

Undyne had gone to the dump with her trash, intending to stay and scavenge for swords...and that was the first time she had seen the Royal Scientist, staring quietly down into the Abyss. Undyne had casually tossed her trash into another pile. "Hey," she had called, startling the lizard. "You don't like you're from around here."

The lizard gawked, staring in surprise. "Y—you're…o—o—oh m—my god…"

Undyne laughed. "Don't let your jaw hit the water," she joked. She was a bit used to strangers recognizing her at this point; due to being the Captain of the Royal Guard. "So, did you move in, or just visiting Waterfall?"

"I—uh—I…um…I had a erm…j—just visiting. I—I'm from Hotland—uh…you okay?" she asked as Undyne made a face.

"Sorry," the fish-woman apologized. "Not really a fan of the place."

"I g—guess that makes sense," the lizard said with a shiver. "It p—probably isn't g—good for you to be in such a hot place."

"Ugh, I know, but if I want to get to the castle, I need to cut through there." She made an exaggerated sound. "Or, Asgore could get a cell phone…"

The lizard looked down sheepishly. "W—would you be o—opposed to going s—still if some—someone put a water cooler between the b—beginning of Hotland and the elevators?"

"No way, that would be great," Undyne replied. "Then I wouldn't feel like I'm dying while going through there…especially in my armor."

"Then I could s—see if I can install one—"

"What—really?" Undyne asked in surprise. "You can do that?"

"I—it helps to be the…R—Royal Scientist…"

Undyne stared in surprise. "You're—wow! I didn't realize! You're Alphys, aren't you!?"

The lizard went red. "Y—yeah…?"

"Asgore's been talking about you!" Undyne exclaimed, not taking notice of how much redder the poor thing was getting. "Heh, glad to finally meet you, but what brings you here?"

"I…c—come here to scavenge th—things th—that fall do—down here for experiments and such…and s—sometimes just to think…" she murmured, her gaze going quietly back to the abyss.

"Heh, guess Waterfall has that vibe to it," Undyne said as she came closer, looking down into the Abyss. "So, what do you think is down there?"

Alphys smiled slightly. "I've got so many theories about that. It could just be an endless maze of waterways, another passage out of the mountain, or…" The lizard paused, looking away sheepishly.

"Or what?" Undyne asked, genuinely curious.

"It would probably sound silly…"

"Aw, come on, try me," Undyne insisted.

"Asgore probably told you what I've been doing…"

"Sorta? Something about trying to use our own soul power to break the barrier or something like that."

Alphys nodded. "It had me researching, and you know, it made me think about where souls go. Maybe they go down there."

"Huh, that's interesting."

"I could go on for hours about this…"

"Then keep going!"

The effect on Chara's soul vanished, and with silent precision, they lunged, leaping at Undyne. Her eye widened as the blade came forward, plunging into her vision with searing, indescribable, horrible, unimaginable pain. Undyne screamed as Chara wrenched the blade back, falling away as Undyne blindly swung, restricting them again. Undyne brought a hand to her eye, feeling blood pour onto her hand.

Blood…good, she was holding on, but as Undyne wiped the blood away, the blackness of her vision remained. She stiffened, clenching her spear. She was blind. Fully blind. The darkness surrounded her completely. A chill ran through her as the reality crushed down on her spirit. She couldn't see—she couldn't see!

Undyne held her breath, taking it in swiftly. Another door closed in her face, and locked forever. No more being able to fight on her own…or at all, no more independence, or watching anime…or even having the option to look at pictures of her loved ones that had vanished. All that she had left were voice recordings.

But then again, Undyne realized, that in a bit, it may not matter at all if she could see or not. She lightly touched the eye patch she wore, unknowingly getting blood on it. If she could go through life without one, then she could get through the rest of it without both. She listened keenly, and then sent a volley of spears forward. "Do you think I can't hit you just because I can't see!?" she demanded. "You're out of luck; I'll still take you down!"

Chara narrowly dodged some of the spears, but when one hit the child, Undyne went wild, sending several where she had heard the sound. Undyne was relentless, never caring how close she would bring this human to death. So long as she didn't kill them, it wouldn't matter. Besides, she had little to nothing left to lose. At this point, it was just to protect the last of her friends, and the Underground…and if she didn't survive, then it would just be written down as a valiant last stand from Undyne, Captain of the Royal Guard.

Undyne fought in the permanent blackness of her world, each little sound being her target to strike. Was the soul lock still going? How much longer did it have? Undyne would have to be extra careful, knowing that if the human got loose again, she'd be in even bigger trouble than before. A sound, the human was still in front of her as she summoned more magical spears.

Chara grunted as several hit them, taking their health down to a considerable amount, but with all the EXP and LV they had, they were still standing strong. They would just have to wait for an opening, and then they could strike at her again, their weapon having taken a considerable amount of health when they had struck her with that one blow.

Undyne screamed as she sent another volley down, the pain was agony, her grief felt worse, weighing down on her heart as the guilt and regrets built up upon her. She had to stay strong, stay standing; she couldn't let this human win! She wouldn't be defeated! She was Undyne! Captain of the Royal Guard! Undyne the Undying was a name she intended to keep until she could render this human helpless!

Alphys… Undyne managed, in her thoughts, her inner voice just as choked. I promise…I'll avenge you…because that's all I can offer.

Ever since the barrier had opened, Undyne had been helping Alphys with finding some way to amend for her experiments, trying to find some way to separate the Amalgamates. Undyne had stayed up late with her on several occasions as she pulled all-nighters, trying to somehow separate them, and keep them alive in their previous forms.

Alphys needed the confidence boost, and Undyne was more than happy to supply it. Whenever they reached a dead-end, she was the one that brought Alphys back out of the dumps…sometimes literally in certain cases when she'd actually go to the dumps to mope. Other times, Undyne would simply pick up the lizard, remove her glasses and put them on the desk, and then dangle her upside down, messing with her until she finally laughed.

"Come on, Alphy," Undyne would say before tossing her up onto her shoulders. "We don't tend to get things our first try, I mean, it took me ages to beat Asgore in a fight. So you're not going to find an answer right away, but relax. They've all been holding together—literally. You have time. So take a deep breath…Alphy, take another. There, better. Look, let's just try from a different angle. If we can't figure out how to get from Point A to Point B, let's see if we can figure out how to get from Point B to Point A."

Alphys froze. "Uh…Alphy?" Then she yelped as the lizard began to flail.

"Why didn't I think of that sooner?" Alphys exclaimed, yelping as she fell, hitting the floor with a grunt, before scurrying over to her desk. "Maybe that's what I need to look at! Start at the end!"

"Because that makes logical sense."

"Have you not seen anime?"

"…point taken."

It was in that moment that Alphys had a breakthrough. It wasn't perfect, they still didn't know what would fix things, but Undyne found that there were fewer times Alphys would be moping in a corner, or visiting the dumps for other reasons aside from salvaging. The lizard was tired more often, simply because she and 'sleep' didn't seem to share a timeline.

However, Undyne was there, supporting her through thick and thin. She tended to fall asleep early on in the nights, but she would surprise Alphys sometimes with drinks. Sometimes tea, or hot chocolate, and once in a while, a soda. Though, when Undyne felt she was working too much, she would literally carry her out of the lab and take her somewhere to just hang out. It didn't really matter where so long as Alphys could stop frying her brain for a little bit.

Things had been getting better for Alphys…she was starting to have faith in herself, and finally emerging from her shell as Undyne and the others broke down the walls she had built around herself. But now…those moments were all gone. There would be no more all-nighters. Undyne couldn't do anything with them. There would be no breakthroughs. Undyne was no scientist. There would no longer be nights of watching anime…because she could no longer see…because Alphys would no longer be there.

The animes would no longer play. The lab would always be empty. There would no longer be progress in her research. The lab coat was forever hung up. The poster rolled up, and the figurine tucked away forever, and now, Undyne couldn't even have the right to seeing pictures, to look back at memories. Short lived memories, for the one month of happiness Alphys was starting to have.

All because of that damn human! It was all gone because of them! "YOU DEMON!" Undyne screeched, hearing a spear hit Chara. She summoned more, having them all crash down in the area where she had heard the human cry out. Chara narrowly avoided getting hit lethally a few times, their health nearly reaching its midpoint.

It was then that their soul restriction left them, and with another yelp to tell Undyne their current location, they swiftly and silently leapt away as spears lodged into where they had been standing. Undyne went dead silent, trying to listen, her ear fins wiggling as she tried to locate the human, and pinpoint where her spears needed to land.

Chara picked up a small rock with a smirk and tossed it into their original position. Undyne snapped to attention, sending spears while Chara moved, using Undyne's own attacks as cover for themselves as they slowly got behind her, grabbing another rock just in case. When Undyne's attacks settled, she paused, ear fins moving. Chara's breath stilled and they threw the rock over Undyne's head, allowing it to land a bit away from where Undyne had originally sealed them.

"Don't think you can run!" Undyne yelled, using her soul restriction, not realizing that she was facing in the completely wrong direction. Not until she screamed as pain blossomed in her lower torso. Chara smirked, their blade imbedded in her, but they hadn't expected for what happened next. The pain didn't shut Undyne down; it fueled her for a last stand.

She screamed her emotional and physical pain, and swung her spear, the flat end of it coming into contact with Chara's head, and sending the child falling back on the ground. Undyne stepped on their chest, and from where the human's sounds were coming from, she judged where to send her spear. The human gave a blood curdling scream as the spear drove through their shoulder and into the ground, rendering their left arm useless.

Undyne panted heavily as the human squirmed, unable to reach their dropped blade, or get out from underneath Undyne. It seemed that perhaps, she had been victorious. The fish woman shook and shuddered, and brought her spare hand to her new wound, but froze. Her hand didn't find blood. No…she felt dust. Undyne quivered, trying to rein her emotions in, but she was already beginning to cry. "Alphys…" she managed, her voice tight.

Unless she could somehow keep herself together until someone found her…no…she couldn't hear anybody, she'd be gone before they got here. "Alphys…I'm so sorry…" she managed. She would crumble, her body would vanish…so would the spear that held Chara down, as it was made by her magic.

However, as Undyne felt her form start to give way, she managed a small, sad smile. She did manage something in her last moments. Chara was injured. The others could at least use that to their advantage—they could have an easier time in catching Chara if they couldn't use their left arm at all. She flinched, and then turned her head up to the sky. She couldn't see it, but she could feel dawn's light falling down on her…and it felt so lovely. "Alphys…"

Her body gave way, and Undyne crumbled to dust, her spear fading away. Her casual clothing collapsed in on itself. Undyne, the undying…had breathed her last, and had followed Alphys into the beyond…perhaps into the abyss that the lizard had theorized.

Undyne's eye patch slowly fluttered down, only to be sliced in half by Chara's blade, and stomped into the ground upon her dust.