Disclaimer: I don't own Kamen Rider, Avatar: the Last Airbender, nor The Last Airbender: The Legend of Korra! They belong to their respective owners!

AN: Just a weird crossover idea I had when I saw the trailer for The Legend of Korra. Enjoy!

Water...

Earth...

Fire...

Air...

I'm Korra, the new Avatar. Almost a century passed since Avatar Aang defeated Phoenix King Ozai and ended the war. Aang passed away almost sixteen years, leaving a new avatar: me.

I learned I was the Avatar at a young age, younger than when most Avatars are supposed to realize their destiny. For the past fews years, I've mastered the elements of water, earth, and fire. The only element left is air, but there's a bit of a problem.

Avatar Aang was supposedly the last Airbender until he gave birth to his children. Unfortunately, they're all grown up by now and have spread out through the entire world. It was only by chance that I heard of Tenzin, the Avatar's youngest son, who happens to be an airbender. He currently lives in the Republic City, a city filled with different kinds of Benders from all over the world. I just I don't run into any trouble along the way...

"Republic City is a long way to go," were the words of those who tried to reach the city only to fail.

Many travelers who traveled to the diverse, metropolitan city would soon find themselves agreeing with those words. Among the travelers was none other than the new Avatar herself, Korra of the Southern Water Tribe. The new Avatar was sixteen with tanned skin, blue and brown hair that was tied into a pony tail. She wore a blue sleeveless shirt with brown pants and shoes. Her form of transportation was her animal guide, the Polar Bear Dog named Naga that she rode upon.

In the center of the Earth Kingdom was the famous metropolis called the United Republic City, yet was referred to by most as "Republic City," or "United Republic." It was said to be a shining peak of what the unity of the Four Nations could achieve, as it was filled with new technological wonders, large buildings that were said to be higher than the walls of Ba Sing Sei. There were times where people were fascinated by the Republic City's glorious architecture and learning, so much that they were willing to travel bare foot. However, Korra was not really interested in the wonders that the city had to offer; rather it was who was in the city that caught her attention.

The young Avatar was seeking the youngest son of Aang, the previous Avatar, and Katara of the Southern Water Tribe, who was said to be a powerful airbender. Korra already learned elements of fire, water, and earth; all that was left was just the element of air. She heard he lived in Republic City, so she thought it would be a good idea to go to the city so she could find him to learn the airbending techniques. However, getting to the city and finding that one teacher out of hundreds, if not thousands, of people living there would be difficult. As of now, Korra rode Naga through the vast forests of the Earth Kingdom as a short cut in hopes of reaching Republic City soon. Unfortunately for her, the current Avatar ran into a problem:

She was lost.

"I probably should have taken that left back at that town," Korra thought aloud as she held onto Naga's reigns.

For what felt like an eternity, the young Avatar found herself wandering the forest of the Earth Kingdom on the back of Naga, trying to find something that would tell her she was on the right track. Unfortunately, Korra found nothing and would continue to find nothing, so she decided pull the reigns on Naga to let her know to stop. "Alright Naga, that's enough," Korra told her animal.

Upon hearing that, Naga stopped walking and flopped to the ground, exhausted from all the walking it had to undertake. Dismounting the saddle on Naga, Korra approached the Polar Bear Dog's head and knelt down for her to be at the same height. "Sorry for making you walk that long, Naga," Korra apologized to her Polar Bear Dog as she patted its furry head. "We'll take a nice long rest. How does that sound?"

Naga let out of a roar of joy at the sound of Korra's offer, making the young Avatar smile at that. However, Korra's motherly attitude towards her animal guide was diverted by the sound of rubble moving as she whipped her head around towards the source of the sound. From what she could hear, the sound of Earth moving made Korra suspect there was a battle between Benders, yet she would not know unless she saw it for herself. "Stay here!" Korra told Naga before rushing off to the source of the sound.

As she ran through the forest, Korra could heard that the sounds of battle becoming louder and louder with every step she took. When she arrived at the source of the fighting what she saw shocked her for there two beings fighting each other. Two beings who were not human. "What the heck?" Korra gasped.

One of the beings was a humanoid creature, obviously male, whose body seemed like it was made from green crystal. The crystalline being wore black pants on his body as well as a black chestplate and round shoulder guards. The creature seemed to carry characteristics of a feline creature with his sharp claws on his fingers and toes that stuck out of his black boots and fingerless gloves. The feline characteristics also were his head that had black eyes, fanged mouth, and two pointed ears sticking out of the top of its head. One notable trait was the black belt it wore around its waist with a green gem in the center.

As for the other one, the figure was male as well, and wore a black bodysuit underneath his golden armor. He had a golden breastplate as well as shoulder pads, gauntlets, and boots. His round helmet had a red piece of fabric sticking out of the back and extending down the to the shoulders. His faceplate was split down the middle by a thin, black line, and the helmet also had a golden horn extending from the forehead, above the large, red lenses that acted as eyes. Around his waist was a white belt with a large golden buckle that had a golden crystal sticking out of the side as well as a golden orb in the center. Hanging from his belt a curved sword with the double-handed, black handle and golden crossguard.

The green crystalline creature swung his right arm that golden armored figure, who raised his left armored hand to block before raising her other to block another swing. When the creature lashed out his right clawed hand again, the golden figure redirected it before punching the creature in his armored chest. That did not stop the crystalline creature as his fist struck the golden figure in his torso armor that protected his side. "GAH!" the golden figure cried out in pain.

As for Korra, she just stood there, watching the fight in awe as she noticed every time the two threw a punch, the earth around them erupted in small chunks of dirt. She could literally feel waves of energy pouring out of the two being's punches as they continued to brawl. 'Just who are these guys?' Korra wondered.

The two beings continued to attack one another until they both threw a punch that landed on each other's armored chest, forcing the two to separate. "This time you won't get away, Altar!" the creature snarled as he pointed at the golden figure, now named Altar.

"Bring it, Jade," Altar challenged.

When he said that, Altar drew his sword from its scabbard, the curved blade glowed with golden energy, much to the Avatar's shock. Korra was more surprised when the creature, Jade, thrust its hand into the earth and pulled out what appeared to be a green sword with a black hilt. "DIE!" Jade shouted.

Jade charged at Altar, who took a low stance with sword pointing downward and both hands gripping it. Jade went for an upward swipe, but Altar blocked it before pushing the crystalline creature to the side. Altar then thrust his sword forward at Jade's chest, which he was able to block yet the impact send Jade crashing into a nearby tree. Jade growled as he stood up before he charged at Altar, swinging his sword at his opponent only for Altar to quickly use his sword to smack it away and thrust it at Jade. The creature blocked Altar's sword with his own, but not before Altar forced him back with a powerful kick to the chest.

Altar went to the offense, thrusting his sword at Jade, who blocked it, but Altar used a free arm to elbow the creature in the face before kicking him back again. Jade charged at his opponent, swinging his green metallic blade at Altar, who brought his own sword forward in time to block the swing. Jade wasn't done as he swung his sword at Altar's feet, yet fortunately for Altar, he brought his sword down in time to block the slash before raising it to block another slash. When Jade swung his sword at his opponent's side, Altar was able to block the slash again.

Korra watch the curved sword covered in golden aura clashed with the green blade as Altar went on the offensive to defeat his opponent. After blocking the slash, Jade slashed his green bladed sword at Raika only for him to block it with his own and then swinging his weapon at Jade's left, which he blocked. However, Korra noticed that the creature known as Jade left his side wide open, and Altar took notice of it as well as he raised his right leg into Jade's side. The green crystalline creature staggered away from Altar and it was at that moment that he noticed the young Avatar watching the entire fight.

When Jade's feline eyes turned towards Korra, he immediately lunged towards the Avatar instead of Altar, much to the surprise of Jade's opponent. As Jade passed him, Altar turned his head to see Jade heading towards Korra and his eyes widen immediately. "Watch out!" he called out to her.

Korra did not listen to Altar's call for she immediately dropped into an Earthbending stance before swinging her arm upward as a large chunk of earth erupted from the ground and crashed into Jade. He was sent flying into a tree some feet away from Altar, who just stared at Korra in shock. "An Earthbender?" he thought aloud.

Turning her head towards Altar, Korra boasted, "Not just any Earthbender! I'm the Avatar!"

Before Altar had time to process this information, both he and Korra turned their heads towards Jade, who was now standing. His eyes on both Altar and Korra, Jade stabbed his sword into the ground and Korra's eyes widen as small pointed spikes shot up from the earth and floated around Jade. "Is that Earthbending?" Korra wondered.

Before she could receive and answer, Korra and Altar found themselves dodging the pointed spikes of earth that Jade summoned. As they dodged, the two eventually found themselves standing next to each other as Altar slashed at some of the spikes with his sword. Meanwhile, Korra used her Earthbending to summon a wall of earth that protected her and Altar from Jade's spikes. Korra and Altar looked at each other, and they immediately realized they were facing a common enemy who needed to be taken down. That left with an option: an alliance.

"Look, I'll go up to him and keep him busy while you use your Earthbending to take him by surprise! Got it?" Altar instructed.

Korra nodded and watched Altar leave the area behind the wall of earth that shielded him from Jade's spike as he charged at the crystalline being. Jade's attention from the Avatar turned towards Altar as he aimed his spikes towards the person he was trying to kill in the first place. Altar slashed at Jade's earthen spikes with his sword as he charged towards the green crystalline creature.

With Altar distracting Jade, Korra saw it was the best opportunity to strike as she ran out of her spot and took an Earthbending stance before When he crossed blades with Jade, Altar noticed this, so he dodged a slash from Jade and quickly leaped away from him to land some feet away from the crystalline being. Jade wondered why Altar did that, but when he remembered about the young Avatar, it was too late as boulders of earth shot up from the ground. He tried to avoid the earthen chunks, yet the Avatar's moves were too fast for Jade as she commanded the large boulders to strike Jade in his chest, sending Jade crashing into the ground.

Altar approached the Avatar, his eyes never leaving the fallen form of Jade as he gripped his hand tightly onto the handle of his sword. Korra never diverted her attention away from the crystalline creature as well as she remained in her Earthbending stance. "Nice job," Altar complemented.

Though she was focused on Jade, Korra confidently smirked at Altar's words. "Thanks," she said.

The two saw Jade using his sword to help up stand up from the from the surprise attack, and glared at Altar and Korra. "This isn't over, Altar!" Jade swore.

With that, Jade swung his arm and his form faded away from existence, much like how a ghost would disappear. Jade's sudden disappearance surprised both Altar and Korra, yet the Avatar was even more shocked as to how Jade disappeared. "Where did he go?" Korra questioned as she dropped her Earthbending stance.

"You shouldn't worry about that," Korra heard from Altar, who slid his sword into its sheath. "Thanks for your help Avatar. I'm grateful for it."

Altar then turned around to head away from the scene, but Korra was not going to let him leave just yet. "Wait! Who are you?" Korra called out to Altar, grabbing his attention.

Turning around to face Korra, he replied, "Name's Altar. Let's hope we meet again under better circumstances."

And so, his form continued walking into the depths of the forest, leaving behind a curious young Avatar with one question in her mind:

"Who are you, Altar?"

AN: And that's it! Please leave your comments in the reviews, and if you have any criticism, please let it be constructive! Now, this story is NOT up for adoption.

Raika out!