In her hobby to learn every spell there was to know in the world, Frieren sometimes ran into spells which couldn't be safely tested around other people. In times like those, she liked to make use of a very special piece of magic she had learned centuries ago a spell which allowed her to travel to other worlds. Some were much like her own, while others were stunningly different, and many just barren, uninhabited wastelands. It was that type of world she would look for at times like this, and today, after checking out a few different options, she happened upon a place that was pretty close to what she wanted.
The land where she appeared was a pretty wide yet barren valley between a pair of mountain ranges. There was little life around that she could see, just the odd shrub or patch of grass and a few insects buzzing around or crawling on the ground. The air was dry, but it wasn't too hot here, which was for the best seeing as she'd come here barefoot. In fact, she wore nothing except her white night gown and a small pouch, having woken up not too long ago and being much too lazy to get dressed properly.
From that pouch Frieren pulled out the scroll with the spell she wanted to try out, and read it thoroughly before putting it away. She closed her eyes and took in the air around her, the ground under her bare feet, the sun against her pale skin—and most of all, the mana within and without her. With centuries of practice, she took hold of it and focused it inside her, letting it fill her up from head to toe. A ring appeared around her then, inscribed with esoteric shapes and runes, floating level with her stomach. The circle expanded, and Frieren expanded with it. She sensed inertia pushing her gently down, sensed more of the ground come under her standing feet, and when she opened her eyes, saw the world appear to shrink around her.
When Frieren first deciphered that scroll and understood that it purported to hold a spell for making people grow, she hadn't been too convinced that it was real. Even if it was, she assumed that it would only be good for growing people to two, maybe three times their size at most, not hundreds of feet tall like the scroll claimed; anything beyond that sounded like pure fantasy based on all she knew about magic.
Now she found that not only was it real, it was also far more effective than she ever dreamt. She hadn't spent much mana on it at all and already she stood a thrilling fifty feet tall. That already made it her biggest magical discovery of the past two centuries, and she only kept getting taller as she kept funneling mana into the spell.
The bigger she became, the more mana it took to grow another foot taller, but with her huge store of mana, Frieren was able to reach around a thousand feet tall before she decided to stop. Not that she had exhausted her mana reserves, but it was best to keep some in case she needed it for something else.
Frieren needed several little steps to get accustomed to the new size and heft of her body, and watched in bemusement the big puffs of dust that appeared around her foot with each step. It was a truly incredible size, so big that it would have made her regular self seem like an ant by comparison. The mountains, too, seemed awfully unimposing now, just little mounds of dirt and stone little taller than she was. After a minute, she went and climbed over one of them to really try out her new size and see what this world looked like outside the little valley.
Not that different as it turned out, at least in this place. There were no more mountains in that direction, and no more life than there was in the valley. If anything it was even more barren out there, except... what was that she saw out in the distance? Many small, greenish objects, arranged in a regular pattern. She took it for a field or plantation at first, until she saw them moving. She walked towards them, and in a short while saw them closely enough to confirm her second theory: that it was an army she saw.
The army of the Earth Kingdom, to be precise. They had been out here since dawn, carrying out important military exercises, but when they first saw that strange figure climb over the mountains and make its way closer, their commanders interrupted the training at once and called everyone to formation, calling on them to prepare to face the giant if necessary, but to hold their attacks until it proved hostile.
The soldiers were scared—this giant was unlike anything they had been trained to fight—but they followed their orders as they had been trained to do, and stood perfectly still as the giant approached. It wasn't long before they saw it was a woman, albeit an odd-looking one. White-haired, but not old in the slightest to judge by her face, and with strangely pointed ears. She might have been cute if not for her size. At least she didn't look hostile, just curious, but that didn't help with their nerves when she came close enough for them to feel the earth shake with her steps.
The giant was one step away now, so when her foot swung forward, the men almost broke formation and scattered. Luckily her feet stopped some dozen yards away; close enough for everyone to see that they didn't even match the height of her toes.
Frieren crouched over the army, scanning their ranks leisurely. Strange; there were no weapons among them, and all the soldiers were poised as if they meant to attack her with hands and fists. Had swords and spears and the like not been invented in this world? How did they mean to fight her off if she tried to attack? Wanting to find out, Frieren held her hand above the little soldiers and slowly lowered it, as if she meant to crush them. The ones close to her hand retreated, but the ones elsewhere counterattacked, launching rocks at her hand.
The rocks were launched straight from the earth, as if by magic, but Frieren couldn't sense any magic being used among them; rather, it appeared to be mediated by the movement of their bodies. What was this power? How did it work? Did it use mana, or some other power source? Frieren had seen nothing like it in her world, nor in any of the other worlds she had visited. Could anyone learn how to do this, or did they have to be born with the ability? She asked the little humans some of these questions, but it appeared they didn't understand her language as they kept attacking. A real pity.
A rich field of study had opened up here, one Frieren wanted very much to explore, but she had come here for other reasons and it was best if she didn't get distracted. She would investigate further once she returned home; all she needed were a few specimens. "Come here, little humans," she said softly as she reached for them. They scattered when her hand approached, using their powers to speed along the ground, but all it took was a simple spell to pull them into the air.
The five Frieren caught floated together above her palm. They were clearly terrified, not that she cared about it. Frieren waited a minute to see if they would do anything, but either they were too scared or their powers were useless this far from the earth; she would find out what was the case eventually, but for now she encased them in small protective bubbles so that nothing would happen to them and stuffed these in her pouch before standing again.
The army was in a rout now, thousands of men fleeing whichever way seemed best even as their commanders ordered them to stay. They only stopped when Frieren raised a hand in the direction of the army and called their energy to her, leaving them so drained that they could hardly stand. It wasn't an ability she often used, and she had never used it on people before, but these humans were so small she hardly registered them as such.
With the army drained and her mana stores refilled, Frieren went ahead and used the gathered energy to fuel a second growth spell. Now the defeated army could only stand and watch as the already gigantic elf grew to dwarf her old size. Her feet expanded across the earth, overtaking thousands of square feet with her gigantic soles. Her toes rushed toward them. Thousands of soldiers were caught by those colossal digits and crushed beneath their resting weight. By the time she allowed the spell to end, only a few hundred soldiers remained alive, cowering between the mile-long feet that had crushed all their companions.
Frieren never noticed their deaths, being far more focused on the pleasure of growth, and afterwards on looking around at the diminutive little world. The mountain she had climbed before now reached only to her ankles, and from her new height she could easily see what lay beyond the whole mountain range—that's where she saw a city surrounded by walls so tall and thick they were clearly visible even from this distance. A city like that was sure to have a great deal of people, whose energy could help fuel Frieren's attempt to test the limits of this growth spell.
To get to that energy, Frieren crossed the great mountains between her and that city, stepping over them with ease. It amused her to feel them crumble away under her feet, offering no resistance to her. Each of her steps carried so much power now that it spread earthquakes for miles around, triggering deadly rock slides all over the mountain range; Frieren didn't notice them, just like she didn't notice the small villages hidden between the mountains she obliterated underfoot. By the time she reached reached the other side, her feet had already caused the deaths of thousands more people—thousands of mites so small they were almost microscopic to her.
With only a few more steps, Frieren stopped right by the outer wall of Ba Sing Se. I was the largest structure ever built by the people of this world, and while it was little less than an inch tall in Frieren's eyes, she could tell it was a real marvel—which made it all the more amusing when she raised her toes and settled them on top of the wall. Many guards were caught under those monstrous digits, and while some survived in the gaps between them, they all died when Frieren curled her toes and crushed them along with that whole chunk of the wall.
Releasing its remains, Frieren casually stepped over the wall and entered the Agrarian Zone, a huge stretch of green fields which occupied most of the space between the outer and inner walls, providing sustenance for all of Ba Sing Se. There were few buildings in that area, mostly tool sheds and the like, but at this time of day, countless peasants occupied the fields. They had been working there until Frieren first appeared, and had watched aghast as approached them all. Now as she stepped over the wall, they fled from her mountainous feet only to be knocked down by the powerful earthquakes that followed each step. All they could do was crawl away and scream in terror.
Frieren crushed hundreds underfoot, but they were spared from further destruction as she reached the inner wall in just a few steps. There she leaned over, looking casting her shadow across Ba Sing Se, looking at the complex grid of streets and buildings below. There must have been hundreds of thousands of people living there; maybe even more.
Of the many structures there, one stood out to her: the Royal Palace. With her magic she lifted it from the earth and placed it in a protective bubble, like the soldiers from before, to bring it home as a keepsake and to get more test subjects. With that out of the way, she drained everyone in the city of their energy, including all those in the Agrarian Zone. The amount of mana which filled her was truly immense. Frieren wondered how tall she could get if she used it all for another growth spell; but first there was something else she wanted to try.
The scroll with the growth spell also contained instructions on how to return to normal size. Frieren had studied those instructions, and thought she could adapt them to create a spell which could shrink its target. She decided to test it now, casting it on the city, and watched it all dwindle away before her very eyes. By the end of it, everything within the outer wall sat right on the ground, no bigger than a single coin. Moving her foot closer, Frieren saw it was smaller than any of her toes. She smiled and wiggled them in delight at her spell's success, rattling the whole city with the thump of each impossibly giant digit. It was only then that she realized she had no way of growing the city back to its normal size; the spell she knew could only grow her, and it would take a long time to work out a derivation that could grow other things. The city was doomed to be tiny even to the people of this world until then.
Frieren could have stored it with the other samples she'd taken of this world, but as she peered down at that pitifully tiny city and saw how utterly her toes dwarfed it, an idea occurred to her which she couldn't resist: to put them all out of their misery. Raising her big toe, she moved her foot so that it hung over the city. To the hundreds of thousands of people down there, the dusty bottom of that toe became their new sky. They screamed in terror at the seemingly endless stretch of dusty pink skin, but even all together their voices never made it past Frieren's foot.
After taking a minute to take in the puny city, Frieren simply let her toe drop and destroyed all of Ba Sing Se with a touch. It was strange to say, but she was thrilled at having ended so many lives like that. Frieren had never been so excited in her life; she realized now that she loved being huge and the power that came with it. And while at her normal size she would have been horrified at the prospect of killing so many innocents, it was hard to care about people so small she couldn't see them. They weren't even worthy of being called people at that point.
With that taken care of, Frieren now used her remaining mana for another growth spurt. It wasn't as extreme as the last one, not after using so much of it to shrink the city, but she still more than doubled her height and reached an incredible fifteen miles tall, reaching far beyond the clouds. She was by far the biggest thing in this world, and she meant to become even bigger.
In the time to come, the Earth Kingdom would be ravaged by the giant elf. Frieren traveled the continent with ease, covering miles with each earth-shaking stride, draining the energy of everything as she passed it all by.
Countless people across the kingdom cowered in fear of her, yet they couldn't tear their eyes away. They watched the giant stride across the land with that horrible smirk on her face, as if she were mocking their weakness, and felt an all-consuming sense of dread and hopelessness as they were robbed of all their energy. Frieren didn't leave it at that, either; every time she absorbed the energy of a population, she made sure to step on it, crushing it under her foot. Millions of people were left staring at her endlessly massive soles as the last thing they saw before their lives were ended beneath it. Only villages too small for her to see escaped that fate, unless she crushed them unawares.
During all this time Frieren didn't use the gathered mana to grow again, preferring to enjoy this size while it lasted; it was fun to feel those cities crumble against her sole, and if she got much bigger they'd be too small to sense. Soon, however, she had drained the whole continent, and then she cast her gaze across the sea where she found herself and saw new lands across it. Not only that, she also saw a bunch of specks on the water in that direction, and some more in the air above them. It looked like a whole fleet of ships, and Frieren stepped into the ocean to investigate it.
At Frieren's size, simply stepping into the water would have created waves capable of ravaging this whole end of the continent and all the lands across the sea, to say nothing of the waves she'd kick up by wading over to that fleet, but she kept the ocean still with her magic so that nothing would be destroyed before she had a chance to inspect it.
And so the whole armed forces of the Fire Nation, riding in their ships and airships, watched aghast as she crossed the sea. She was so tall that even here, in one of the deepest parts of any ocean, the water barely reached above her knees. When she stopped in front of the fleet, the ships all floated right before her enormous thighs, the men all staring up at her face in the sky. They were too stunned to do anything while she leaned over to get a closer look at them. They knew that even all together they were no match for this behemoth. But then a bright red light appeared out on the horizon.
It was the sign they had been waiting for today: Sozin's comet, which appeared in the sky once every hundred years. The comet brought incredible power to all firebending, and it was the reason why they had chosen this day for the grand invasion of the Earth Kingdom; now it seemed the perfect thing to help them against this giant.
Frieren, too, looked curiously at the distant comet, something the fleet took advantage of to reposition themselves. They spread out around the giant so they could all focus fire on her, then all of them let lose together, shooting giant fireballs at her skin.
When the first of them hit, Frieren looked down to see what was going on. It surprised her to see the tiny ships producing such incredible bursts of fire, far beyond what almost any mage from her world be capable of. And yet even with all that power, the most any of those pitiful specks could manage was to make her feel a warmth wherever their attacks hit. "How quaint," she mused, and with those words extinguished the last hope any of the firebenders had of defeating her. The fleet was already beginning to scatter and retreat when she reached for them.
Massive fingers dipped into the water, and even with her magic minimizing the disturbance, still the ships were rocked by the powerful waves. She scooped up a handful of them, along with billions of gallons of sea water, and lifted them to her face, even catching some airships which crashed into the water and sank.
Each mighty ship was only a couple millimeters long to her. She scooped one of them up with just her fingernail, and it promptly got wedged between the nail and the flesh of her finger. All its crew abandoned the ship before it could get crushed there, and crawled over the giant fingertip, which to them was like a small island. Frieren didn't notice them, though, and after crushing the ship she simply turned her finger around and sent them all falling off.
As she waved her finger above the remaining ships, some of them shot more fireballs at her. Frieren noticed that these weren't made using magic, either, which obviously meant she had to study them, so she put one of them in a protective bubble and stored it in her pouch with everything else. Afterwards she drained the remaining ships of all their mana.
The crew slumped helplessly onto the deck, and watched as Frieren's magic pulled their ships up and into her cavernous mouth. Then they were dropped onto her tongue, and all the men they held spilled out onto the sloppy pink surface, where they floated among taste buds bigger than any of them, until her tongue began to stir. It carried them and their ships towards her teeth, where they were all ground away. Then she swallowed it all with a gulp that could be heard by all their companions below.
As for the others, Frieren decided to deal with them swiftly so she could continue to the Fire Islands. With her magic she raised currents in the sea and air to pull all their ships back, until they were all floating between her thighs.
Many of the ships crashed into each other, and barely remained afloat. One of them was sent much, much higher than the others by the powerful air currents, flying under Frieren's nightgown and towards her rear. There it careened out of control until it went between her cheeks and got wedged there, held softly by the resting weight of those mountainous glutes. Frieren didn't notice it, but when she pressed her thighs together to crush all the other ships between them, she unknowingly crushed it with her ass.
All this was very much visible from much of the Fire Islands, including the one where Team Avatar had been planning their efforts against the Fire Nation. They had known she was coming for a long time, even before her head first appeared above the horizon. Toph had sensed her powerful steps on the earth, even from all the way across the planet. The others hadn't quite believed her when she told them the sheer size of the woman she felt, until Aang tried to focus his senses on the earth too and felt something of what Toph described. Even so, it was only when they saw Frieren with their own eyes that Katara, Zuko, and Sokka realized that Toph hadn't been exaggerating.
Though they had been ready to stop a whole war effort by themselves, after seeing Frieren dispose of the Fire Nation military so quickly, even with the comet powering them up, it was clear there was nothing they could do to stop this monster. Just by walking around, the giantess was a bigger threat to the world than the Fire Nation had been, especially if Toph was right about her having crushed so many cities already. When they saw her walking right towards them, the only thing they could do was fly away as fast as they could on Appa.
Soon Frieren was standing at the eastern end of the archipelago, towering above all its islands. That's when she put all the mana she had been gathering to work into another growth spell, one which pushed her to one hundred miles tall. Her toes were the size of mountains now, and the highest clouds floated around her ankles, looking like mere cotton puffs to her. Chuckling at the sight of the puny islands before her, she raised a foot that was a long as she had just been tall and held it over the first and smallest of the islands, seeing that it was small enough to fit entire under one foot.
Team Avatar watched that giant foot appear in the sky. Titanic toes wiggled over their heads with such power it caused a rumbling in the air, threatening to obliterate everything. Aang had to use his airbending to help Appa speed up, and even then the Gaang wasn't sure they'd be able to get out ahead of the giant's foot. It was by pure luck that they survived, finding themselves in the wide gap between Frieren's toes when she finally lowered her foot. Even so, the impact was immense. The blast wave that followed launched Appa away along with the rest of the Gaang. Aang was barely able to soften their landing before they hit a rock in the middle of the ocean.
The other people the island was nowhere near so lucky. Every last one of them was crushed the instant Frieren's foot hit the ground, and their island crushed and made to sink in the sea. Their homes, their families, everything was destroyed solely for Frieren's fun, an yet all that destruction hardly satisfied her. Just a few seconds later she had already moved on to step on the next island, and the next and the next, as she made her way to the biggest one around.
From their palace the Fire Lord Ozai and his daughter Princess Azula watched the destruction of their nation, of everything the royal family had achieved over these past hundred years, powerless to do anything to protect it. While moments ago they had been utterly pleased with the conquest of the world they already saw as a foregone conclusion, now they were left feeling like specks in the presence of this invader.
They were utterly invisible to Frieren, but the same didn't hold true for their city. She saw it there above the coast and, turning her back to it, she leaned back until her butt crashed into the island. The Capital wasn't crushed—it sat snugly in front of her, right between her two thighs—but it shook so bad that many buildings collapsed. Those who survived the destruction looked up at the enormous pair of thighs which flanked their city, and at the terrifying smirk worn by the giant. Then those thighs began to close around them.
More and more of the city was overtaken by those gigantic pale walls, everyone and everything crushed by the slightest contact. With death upon them, whatever firebenders remained there harnessed the power of the comet to counterattack, but it proved pointless. Even Ozai and Azula, two of the greatest firebenders in the world, could barely tickle Frieren with the lightning they hurled at her skin.
Their attacks drew her attention; here was another ability she would have to study. And so she plucked the royal palace from the city and put it in another bubble for safekeeping, with Ozai, Azula, and all the servants and ministers there with them.
With that taken care of, nothing could stop the capital's destruction, and soon Frieren had turned the whole city to dust between her thighs. The Fire Nation's threat to the world was ended, but now who could possibly stop her from destroying everything else?
It wasn't just the humans who could see what a danger she posed to everyone; the spirits sensed it too, and though it might already be too late, they knew something had to be tried. So in an act of desperation, the spirit world reached out to their champion, the Avatar.
Aang was still unconscious on that rock after his rough landing, but now he awoke with a powerful sense of urgency. His eyes began to glow; with his energy blockage healed courtesy of the spirits, the Avatar State awakened within him, and he began gathering the elements around him. With the sea and the earth shaking around them, the rest of the Gaang hopped on Appa and took to the sky for their own safety, leaving Aang to do his thing. With the blessing of all the spirits, he wielded far more power than any Avatar before him ever had. Earth and water gathered around him, forming a gigantic structure which kept growing as he approached the giantess. He wielded the elements on such a scale that it would have ended millions of lives, if Frieren hadn't already done the job herself. The remains of the islands she had crushed all came to join him, and even huge chunks of the planet's crust. With their additions, the structure around him began taking shape as something thick and roughly humanoid, which walked across the sea to Frieren.
It amazed her to watch the thing growing so much bigger in so little time. Even so, it only stood as high as her knees when it reached her, so she didn't take it as much of a threat until it shot out such powerful jets of fire. For the first time since coming to this world, Frieren was forced to defend herself, putting up a shield to block the attack. It was actually a problem for her; she had used up so much mana in growing to this size that she had little left to defend herself, and she had killed off most of the Fire Islands without bothering to harvest the energy of their inhabitants, so she might not be able to keep this up too long. At least she only had to worry about attacks from this one direction.
Frieren counterattacked with a magic missile, but even though she struck the earth-and-water construct, it simply pulled itself back together after the attack. Still, in the moments before that happened, she saw something glowing through the cracks, and sensed a deep store of energy inside, which held far more of it than all she had absorbed since coming to this world. That, she knew at once, was the key to victory.
Though the construct was smaller than her, it moved far more clumsily from what Frieren could see; no doubt coordinating all those chunks of earth was a big hassle to whoever piloted the thing. After blocking yet more of its attacks, Frieren sent out a blast wave to knock the thing off-balance, then swiftly rushed towards it while it was busy righting itself. With another magic missile she reopened the cracks caused by the last one, then she placed her hand over the openings and took for herself the rich store of energy therein.
Aang panicked as soon as he felt all that energy start to leave him. He tried to hold on to it, to pull it back, maybe even take some of Frieren's, but it all slipped away from him. He would have needed decades of experience with energybending to challenge her abilities. More and more of his power—the power of the entire spiritual world—went into her.
Frieren had never held so much energy before in her life. It tingled all over her body and enhanced all her senses. She could see more clearly than ever before in her life, well enough that when she finished draining all that energy and the construct started falling apart, she could see the young boy at its center. With her magic she pulled him from the air and brought him to her hand, where she peered down at him. "Were you the one who directed that construct? Impressive, for something so small." While Aang trembled on her palm, something else caught her eye below: a strange flying animal carrying a group of kids. "Are these your friends?" Her magic caught them too, and set them all down next to Aang. They all rushed to him, checking to see he was still alive. "You did me a big favor, bringing all that energy for me, so I'll spare your lives. I'll bring you back to my world, too, so you can show me how you did that. But first you're going to see what I do with this power you gave me."
Frieren's palm had already seemed like an alien landscape to Team Avatar, but as she cast another growth spell, it came to seem more like a whole world. The wrinkles of her skin had seemed like a series of shallow ravines now grew to a thousand times their size, until they were miles wide and miles deep. Everything about her was so huge and yet so far away, it was hard for any of them to understand how big she was now, at least until she turned her hand around and showed them a distant blueish sphere floating between her feet. "Your world looks so small from here, don't you think?" Frieren said. It was only the size of an apple compared to her, so pathetically tiny that Frieren couldn't even see the destruction she had wrought on that world.
Though much of its population had already been destroyed, still millions and millions of people down there looked across at the massive feet which now flanked their planet, unable or unwilling to believe the reality of the horrors they saw. The same was true of Team Avatar, sitting far away on her palm and watching as her planet-dwarfing feet wiggled playfully around their home world. Sozin's Comet, whose coming arrival had so frightened them earlier today, was only a tiny red speck in their eyes; it was snuffed out by a wiggling toe that passed dangerously close to their world.
Frieren's soft chuckle rumbled in the ears of everyone still alive to hear it. "I really must thank you all. Without everyone's help, I never would have been able to push the growth spell this far. Now I can enjoy finishing off your planet. Enjoy the spectacle, everyone."
Frieren's massive, shapely soles descended on the planet, halting its spin, plucking it from its orbit. Huge swathes of its surface were snuffed out against her skin, milling countless people. She rolled it between her feet, killing millions more with each second, while humming softly to herself.
Very few people survived on the planet now, mostly the waterbending tribes at the poles. They saw the land around them crack as Frieren casually squeezed the world between her feet. The cracks spread further and grew wider, and hot magma spewed out from them consuming everything it touched. Even if Frieren left now, there was no way the planet would hold together, but she had no intention of leaving it like this. Who knew when she would get another chance to be this powerful? Best to enjoy it while it lasted.
She kept pressing her feet together, enjoying every second of the planet crumbling away between her soles. Its hot magma was harmless to her, warming her feet and nothing more. The world was almost completely wrecked now, just a shattered mess deformed by the pressure from her feet. The south pole had been crushed between her heels; only the north pole remained, now pushed up to the level of her toes, which wiggled threateningly all around it, terrifying the final few remnants of humanity. Finally, Frieren curled her toes, and the north pole too was obliterated. And with one final press, she popped the whole planet like an overripe fruit, grinding up part of it between her soles while the rest of it slowly drifted away to space.
The Gaang was still aghast at watching their world be destroyed so casually when they were turned around to Frieren's face again. Then they found themselves helplessly plucked from her palm by her magic, and trapped in a bubble from which there was no escape. And so she stored them in her pouch with everyone else. In time she would go back to her own world, where everyone she had collected would live out the rest of their lives as her pets and test subjects, mere specks in a world far too large for them, never again to return to see their home world or return to their normal size.