Undyne knew what was happening. The kid was barely ten feet away and she was already dispersing into the wind like so much ash. That human, no, that creature had slain her as if it was nothing.

"Somehow... with just one hit... I'm already... Already..." She clenched her fist. "Dammit... Papyrus... Alphys... ASGORE... Just like that I've... I've failed you." And that's how it ended. Like that, Undyne, captain of the Royal Guard, turned to dust. The wind howled, as if mourning as her dust began to blow away.

"..."

But she refused.

"No..."

She pulled herself together, literally forcing herself to reform with nothing but sheer force of will.

"My body... it feels like it's splitting apart. Like any instant... I'll scatter into a million pieces."

She stood fast against the wind, defying it. Rebelling against its threat to spread her across the world she would protect. Though she could think of no better place for her dust, it wasn't time for her to die. Not yet.

"But deep, deep in my soul, there's a burning feeling I can't describe. A burning feeling that WON'T let me die. This isn't just about monsters anymore, is it? If you get past me you'll... you'll destroy them all, won't you? Monsters. Humans. Everyone. Everyone's hopes, everyone's dreams, vanquished in an instant. But I WON'T let you do that. Right now, everyone in the world..."

She opened her one good eye, and in it was fire and the wrath of a thousand suns.

"I can feel their hearts beating as one. And we all have ONE goal. To defeat you. Human. No, WHATEVER you are. For the sake of the whole world, I, UNDYNE, will strike you down!"

A light flashed, and the heroine appeared reborn, with the wills of billions spurring her forward. The wind roared against her face and the ground stood beneath her feet. She couldn't lose.

"You're gonna have to try a little harder than THAT."

The howling of the wind filled her with determination.

Undyne stopped the human's soul in its place. There would be no running away. But, always honorable, she tossed them a spear. After all, what sort of heroine would she be striking down an unarmed foe.

The battle begun. The human was deft, blocking each of her attacks as if they knew what was coming. When she loosed her green magic's hold on the human's soul to prepare for another onslaught, the human dodged with a swiftness and dexterity she hadn't even seen from Papyrus. And their assault never ended.

Bit by bit, the human child chipped away at her, wearing her down as relentlessly as a stream would a mountain. Their LOVE was insurmountable, their desire to kill unstoppable. In the end, she was defeated.

"Dammit... So even THAT power... it wasn't enough..? ... Heheheheh..." She grinned. Then she started laughing, desperate, loudly, bordering on mania.

"You've taken everything... And nothing... Nothing's going to stand in the way of your hatred, is it?" She succumbed to another fit of sharp laughter. "Papyrus... Alphys... Aaron... Woshua... Shyren... You didn't spare any of them... And you're going to keep going, aren't you?" She began to melt, each laugh shaking her as her form's integrety began to deteriorate.

"ASGORE... I've... hahaha... I really have failed you..." She hung her head, as her face began to drip with the rest of her body.

She knew that Asgore wouldn't absorb the human souls. Even if her final call, her warning to evacuate reached his ears... the world was done for.

And she couldn't let that happen. The burning in her soul grew brighter, and as if called, six more glows joined it.

With the last of her strength, Undyne raised her spear with her near-formless arm and threw it with the fading remnants of her might.

The human dodge it with ease...

...But it hit something else.

And the world RESET.