Thank god for Comic-Con. This will be a two-shot. This is purely speculative, based upon what I saw from the animatics and concept art of LOK Book 2: Spirits. Has to do with the scene with the (heartless?) shadow that attacks Korra. Will have Makorra in it, fair warning.

It probably sucks cause I tried to make it as simple as possible. And it's really short. Oh well.

DISCLAIMER: Do not own LOK or anything related. Byrke and Nickelodeon does.


Spirits

At first, it only sounded like the wind, howling past the animal skin walls of her tent and in between the mountains above. It echoed and reverberated as if trying to shake the very earth with its sound. Yet, as she woke further into consciousness, Korra realized it wasn't the wind. Something was actually howling, so piercingly that it began to make her ears ring.

Naga.

Cursing quietly, the Avatar bolted up in her fur-blanketed bed. Forgetting her parka, she quickly slipped her feet into her still damp boots, not even waiting to touch the soles before untying the entrance flap to her tent. Sprinting outside, she spotted her best friend irritated by something in the distant snow covered valley. The polar bear dog's head was lifted high into the air as she cried out into the subtle wind, her tail between her rigid legs and her hair standing on end. Something wasn't right.

"Quiet Naga!" Korra hissed as she reached her companion's side. "You'll wake everyone up!"

For a moment, the Avatar's presence seemed to settle the polar bear dog when she licked her master's face swiftly with a wet tongue. Yet, she let out another wail as Korra felt a series of shivers pass underneath her thick white pelt. The Avatar furrowed her brow with uneasiness, knowing full well Naga would listen to her instruction without fault.

"What's going on?"

Turning, Korra's heart sank as she saw Bolin, Mako, and the rest of her company exiting their own tents with tired countenances. Everyone had exhausted themselves from the festival in the Southern Water Tribe earlier that day and wanted nothing more than to recover. So much for trying to keep things quiet.

Korra had no time to tell the others everything was fine before a shiver ran up her own spine, chilling her in place. No, the cold of the South Pole could not do that to her, she had adapted to it as a child. These tremors originated elsewhere, from an unsettled nerve in the pit of her stomach, from her instincts. Whatever Naga had sensed had gotten close enough to trigger her own senses.

She directed her attention to the snowy expanse in front of the hill her tent was perched on. Snow drifted to the ground steadily, almost eerily. The festival lights still twinkled in the distance, her only source of light besides the crescent moon.

Then, she saw it, barely at first, for she almost believed it a trick of the lighting. Yet, something moved again a few meters away, a dark figure, hiding in the shadows of the snow. It grew until it stood tall, as if it formed from the ground itself.

"What…is that?"

Korra's voice caught when menacing, sapphire eyes ignited the figure's head. Suddenly, it hurtled toward her, zigzagging across the snow as its eyes streaked with its movements. She had no time to cry out before the thing lunged at her, slamming a streak of blackness at her chest. The Avatar went flying.

"Korra!"

The snow provided little cushion when Korra crashed onto the ground and continued to roll at the sheer force the figure exerted on her. She couldn't stop herself and lost all sense of direction until she finally felt her back smash against a wall of rock. Gripping the rock, the Avatar tried to stand but freezing tendrils of shadow snaked around her forearms and hoisted her against the wall, pinning her in place.

Korra could only stare. The figure greatly outsized her as it stood on distorted, muscular legs of black. Its body was completely shrouded in darkness, but it congealed to form a figure covered in black sludge. Though, it certainly didn't feel squishy or gross. No, it shook Korra to the core. The tendrils grasping her not only froze her skin, even underneath her new armbands, but they seemed to pump unimaginable terror and sorrow into her veins and nerves, pulsating throughout her being. Her breathing sped up and began to tremble along with her body. Her heart raced along with the nightmares in her mind.

Yet, nothing unnerved Korra more than the figure's eyes.

The sapphire streaked behind its head, flaring like lightning captured in a state of stillness. Its pupil-less gaze bore right into her soul, seeking her memories and emotions, her hopes and fears. They transferred all the pain and despair of the world into her heart, with a mere stare.

Korra could not move, would not move. She was utterly entranced.

Avatar. Your time in this world is at an end. Mere mortals can no longer maintain this plane of existence. The true masters must reclaim their creations…

Images flashed in front of her mind's eye. Two silhouettes walking in an open forest of trees made of a single, circular leaf, stretching out beyond the horizon. An ancient path of stone leading to a temple high in the mountains. A swamp flooded with golden water and inhabited by strange birds. A section of cracked and uprooted ice with a green, eerie glow spilling through the fissures.

You're time has ended. Come back and join us, Avatar.

Then everything went black.