Shiro Shinobi: [Narrating a newsreel.] After fusing with Vaatu, Unalaq became a Dark Avatar and ripped Korra and Raava apart! By destroying Raava, Unalaq and Vaatu transformed into the most powerful dark spirit that's ever lived. Tenzin managed to free Jinora from the Fog of Lost Souls, but her spiritual quest isn't over yet. Can anyone save the world from eternal darkness?
Republic City
The scene begins with the Republic City skyline, the sky illuminated by spirit lights. Police airships and United Forces battleships are deployed to protect the mainland. Cut to a close-up of Air Temple Island, before cutting to the balcony where Pema and her three younger children are standing.
Ikki: Oooo ... Pretty.
Cut to the interior of a police airship where President Raiko and Chief Lin Beifong are in.
Raiko: General Iroh, are your ships in position?
Iroh: [Via an intercom.] Yes, Mr. President. But I need to know what kind of enemy we're dealing with.
As Iroh is speaking, the sky lights up and Unavaatu plunges into the sea. The wave he creates pushes back one of the battle ships.
Unavaatu: It's time to take back the physical world.
Unavaatu begins to walk toward the mainland. Cut to the interior of Iroh's battleship, where he watches Unavaatu approach them.
Iroh: Fire!
United Forces firebenders attack Unavaatu with large fire blasts, but Unavaatu continues walking, unharmed. He retaliates by waterbending a wall to stop the blasts, before sending the wave toward the battleships, scattering them. He subsequently walks up to Avatar Aang Memorial Island.
MeeloMonster attack!
Unavaatu wraps his tendrils around the statue of Aang, before bringing it to the sea. Cut to a close-up of Aang's face, slowly sinking into the water, which fades to a close-up of an unconscious Korra in the South Pole.
The South Pole
Tenzin: They're over here. [Far shot as he kneels by Korra's side while his siblings run in from either side of the screen, tend to Mako and Bolin; to Korra.] Please, wake up. [Carries Korra.]
Kya: They're gonna be all right. But I need to get them into some spirit water. Right away.
They then see Zakai as he was dead and Tenzin then asks Kya for help.
Tenzin: Kya!
As Kya checked to see if he was alive she looks up and shakes her head.
Kya: I'm sorry. He's gone.
Tenzin: We shouldn't leave him here like this. We need to take him.
The Spirit World
Cut to a shot of the spirit portal from inside the Spirit World. Tenzin appears first, carrying Korra bridal style. Bumi and Kya are right behind him, with Bumi carrying Mako and Bolin on his shoulders. Behind them we see Zakai being dragged on a sled of ice as he will be put to rest soon.
Cut to a shot of nearby water. Tenzin wades in and gently puts Korra down. Cut to a further off shot, revealing Bumi to have done the same. Cut to a frontal shot of Kya as she begins to heal them. Switch to an aerial shot of Korra, Mako, Zakai, and Bolin in the water, a stream of illuminated water passing over them, mirroring Kya's movements. Cut to a side-shot of Korra's face as the light passes over her and she opens her eyes. She shoots up and gasps for air, Mako and Bolin doing the same besides her except for Zakai.
Tenzin: Thank goodness you're all okay.
Korra: [Walks up to Tenzin, who tries to support her.] Did you find Jinora?
Tenzin: [Offers Korra a hand.] I was able to rescue her soul, but she wasn't ready to return to her body yet. [Helps her out of the water; cut to a closer shot of the two of them.] She sensed that the world was in grave danger.
Korra: [Dejectedly.] She was right. [Walks off and sits on a rock.]
Tenzin: Were you able to stop Unalaq and Vaatu?
Korra: No. They fused, then Vaatu ripped Raava right out of me and destroyed her. Vaatu won.
Bolin: [Scared.] No. I am too young to live through ten thousand years of darkness. Korra, can't you talk to one of your past lives or something?
Korra: When Vaatu destroyed Raava, he destroyed my connection to the past Avatars too.
Tenzin: If that's true, then-
Korra: The cycle is over. I'm the last Avatar. Zakai he tried to save Raava and... [Tears up.] and he died and I couldn't save him. [Cries.] I'm so sorry, everyone I'm-- [Continues to Cry.]
Cut to the rest of the group, who look on sadly. Kya walks up to her younger brother.
Kya: She needs you now, more than ever.
The Real World; Republic City
Cut back to Republic City, where multiple planes fly by Unavaatu. Unavaatu catches a plane with his tendrils. The pilot manages to eject before the plane is pulled down and slammed onto the water surface where is explodes. Cut to the airship where Raiko and Lin watch the damage done.
Raiko: [Worried.] It's going to destroy the entire city.
Unavaatu shoots out an energy beam at the airship, destroying the tail propellers. The airship begins spinning and hurtling toward nearby buildings. Cut to the interior where multiple police officers brace themselves. Lin pulls a lever, opening the back door, and gestures for her officers to bail out.
Lin: We're going down!
Multiple metalbender cops jump out of the airship, shooting their cables for a safe landing. Raiko walks up and clings on to Lin, who aims her cables at a rooftop gargoyle before jumping off. The duo lands on a roof, where they continue observing the damage. Cut back to Unavaatu who shoots out vines which engulf the harbor and many Republic City landmarks. Cut to Varrick's cell where Varrick is exercising while listening to a radio.
Shiro Shinobi: It's pandemonium in the streets! Giant vines are destroying everything. This is Shiro Shinobi, signing off!
As Shiro signs off, a large vine destroys the wall of the cell, throwing the radio and Zhu Li off balance, but completely missing Varrick who coincidentally ducked during his exercise. He walks up to the hole and puts on a pair of goggles.
Varrick: Zhu Li, commence "Operation Winged Freedom". [Zhu Li ties a backpack to herself before latching onto Varrick's back. She tightens the clasp around Varrick's waist before the duo leaps off the cell.] Do the thing! [The backpack opens up into wings, and the duo soars off into the skies.]
The Spirit World
Cut back to the Spirit World where Tenzin is trying to console Korra.
Tenzin: The other Avatars may not be able to help you anymore, but, perhaps I can.
Korra: [Hopelessly.] No one can help me now.
Tenzin: [Slightly hurt.] I know I haven't been the best mentor to you. But I realized it was because I had a lot of spiritual growth to do myself. There may still be a way for you to stop Vaatu.
Korra: How?
Tenzin: [Kneeling next to Korra.] Let go of your attachment to who you think you are, and connect with your inner spirit.
Korra: Haven't you heard anything I said? Raava is gone. I'm not connected to a spirit anymore.
Tenzin: I'm not talking about Raava. Raava is not who you are. [Stands up.] Come with me, I need to show you something.
Korra turns to look at Tenzin dejectedly, but still follows him. The duo walks up to a large, gnarly, old tree.
Korra: Why are you showing me Vaatu's prison?
Tenzin: Because this tree had a history long before it held Vaatu. This is the Tree of Time. And the legends say its roots bind the spirit and physical worlds together.
Korra: And, you think this tree can help me somehow?
Tenzin: Yes. I have read that long ago, the ancients would meditate beneath this tree and connect with the great cosmic energy of the universe.
The duo enters the hollow of the tree, and as Korra enters, various memories appear, ranging from her adventure regarding the Equalists to Wan's past.
Korra: These are my memories.
Tenzin: The Tree of Time remembers all. Korra, the most powerful thing about you is not the spirit of Raava, but your own inner spirit. You have always been strong, unyielding, fearless. [Korra's memories fade off, with an image of Avatar Wan replacing them.]
Korra: Avatar Wan.
Tenzin: Before he fused with Raava, Wan was just a regular person.
Korra: But, he was brave, and ... smart, and always wanted to defend the helpless.
Tenzin: [Memory shows Wan feeding multiple woodland animals, and him defending the spirits from firebenders.] That's right. He became a legend because of who he was, not what he was. He wasn't defined by Raava anymore than you are. [A memory of Unavaatu laying waste upon Republic City emerges.]
Korra: [Gasping while watching the memory.] Everyone in Republic City is in danger.
Tenzin: You have to help them, Korra.
Korra: How? We're half-way around the world.
Tenzin: [Putting his hand onto Korra's shoulder.] Do as the ancients once did. Connect to the cosmic energy of the universe. Don't bend the elements, but the energy within yourself.
Korra: You really think I can do this?
Tenzin: I have no doubt.
Korra: [Hugs Tenzin.] Thank you for not giving up on me.
Tenzin: I'm proud of you.
Tenzin walks out of the Tree of Time, but before he exits, he turns around to see Korra seated in a meditative position. He exits the tree, leaving Korra alone to meditate. As she meditates, a memory of Wan airbending alongside Raava emerges.
Wan: [Memories.] If you and Vaatu have the same fight every ten thousand years, why hasn't one of you destroyed the other?
Raava: [Memories.] He cannot destroy light, anymore than I can destroy darkness. One cannot exist without the other.
Unavaatu: [Memories.] Find the light in the dark.
Korra's Spirit Center
The scene zooms in to Korra's face before fading through white, changing to a scene of Korra standing on astral lights. She opens her eyes and turns, seeing a large projection of herself, holding a ball of light. Korra looks on with determination and walks toward the ball of light. As she enters it, a large blue projection of herself exits her body and the Tree of Time.
Outside the Tree of Time
Cut to the outside of the tree, where everyone looks on in shock and surprise. Korra's projection reaches out to the overlapping portals and is sucked through, disappearing through the base of the portal.
Bumi: Uhhh ... what did you say to her exactly?
Through the Spirit lights
Cut to a frontal shot of Korra's projection as she speeds through the spirit lights.
The Real world; Republic City
Cut to Republic City, its buildings surrounded with vines; an emergency alarm blares. The shot pans to the left, revealing Unavaatu standing in the bay, his arms stretched toward the water as he controls the vines that are overtaking the city. Cut to a frontal shot of him as he looks up. Switch to a back-shot of Unavaatu, showing a blue light coursing through the sky. The light intensifies into a bright ball. Cut to a side-shot of Unavaatu as the bright ball slams into him, knocking him back, ricocheting over the water's surface. Cut to a frontal shot of Korra's projection as she stands up. Cut to an overview shot of the bay, which is replaced by a frontal shot of Pema, Ikki, and Meelo looking on in surprise.
Ikki: Korra's back!
Meelo: And she's a blue giant!
Unavaatu rises up from the water and prepares to battle Korra. Both entities fire out their respective energy beams from their chests, but Korra focuses her beams to overpower Unavaatu's, eventually knocking him back. Korra runs forward, but Unavaatu shoots out tendrils toward her, which she catches and uses to immobilize and grab him before slamming him toward a nearby mountain. Korra leaps forward and holds Unavaatu's head with her right hand, while desperately searching for Raava within Vaatu.
Unavaatu: You're looking for something that is gone. [Ensnares Korra with his tendrils.] Raava has been destroyed. And soon you will be too!
Unavaatu fires a close range energy beam at Korra, knocking her unconscious.
The Spirit World
Cut to the Spirit World, where a swarm of dark spirits approach the Tree of Time.
Mako: They're coming for Korra!
Mako shoots out lightning toward the spirits. His attack is followed by Tenzin, Kya, and Bolin, who attack the spirits with their respective bending elements.
In some place else
We see Zakai who is floating with Jinora somewhere as she seemed to land on a red energy bridge and we see Zakai looking around.
Zakai: Where am I?
Jinora: Your in your body.
Zakai: But why am I here? I'm dead.
Jinora: Not quite. When you were stabbed Raava actually survived.
Zakai: What?
As Jinora then pointed in a direction we see Raava who was inside a red sphere not moving as Zakai walks towards the Light Spirit and Jinora follows him.
As Zakai looks at it Jinora stops him as she then offers a choice.
Jinora: Hold on, Raava wants you to have a choice.
Zakai: What choice?
Jinora: For you to use Raava and be the Avatar for her.
This made Zakai wide eye Raava as it all the power of the Light Spirit in his grasp he could use it on himself to save Korra possibly be rid of his Fate of being the Dark Avatar.
The Real World; Republic City
Back at Republic City, Korra stumbles from the attack, but Unavaatu fires another energy beam at her, knocking her unconscious. Unavaatu bends out purple streams of water around her, preparing to corrupt her spirit.
The Spirit World
Back at the Spirit World, Team Avatar is forced to retreat to near the Tree of Time. Cut to Bolin who attacks the spirits with earthbending, but a spirit drags him away, though before it could attack, the entity was destroyed by a water stream. Cut to near the portal, where Desna and Eska attack the dark spirits.
Eska: Leave my Bolin alone!
Desna: I am so done with spirits.
Bolin: [Sliding toward Eska.] Eska! I love you! [Kisses Eska and bends a rock.] Let's face the end of the world together!
EskaYou're so romantic.
As the trio attack the spirits, the scene changes back to Zakai and Jinora.
Elsewhere
Jinora: Raava is giving you a chance to choose, if you fuse with Raava you'll be the Avatar you'll never have worry about becoming the Dark Avatar.
As Zakai was actually tempted to grab the light Spirit but he stops before giving an answer.
Zakai: No.
Jinora: No?
Zakai: I know being evil is bad and hurting a lot of people is bad but it's what you do with your power you have. I've learned a lot from this Spiritual journey. But Raava needs to be with Korra and if I die then it's sad for others but if they live because of Korra helping them then it's ok. I want Korra to have Raava back. Can you do that?
Suddenly Jinora was smiling as she told something different.
Jinora: Good. I needed to be sure.
Zakai: [confused.] Huh?
Suddenly a white light engulfed Jinora and we see some sorta Cosmic Spirit.
Zakai was shocked to see it looked like Raava and Vaatu but it was grey with Purple crest on its chest as it entered into Zakai and suddenly a purple crest of whoever that spirt was it was showed up on as Zakai felt different he suddenly grew to enormous heights while retaining his physical look as we see a purple projection energy as his eyes were white instead of Red and looks at his form but then sees Jinora and Raava as he holds the two tightly and flys away to somewhere else.
Republic City
Back in Republic City, where Unavaatu is near success in destroying Korra.
Unavaatu: With you out of the way, I will be the one true Avatar.
A Purple light shines over the City as Unavaatu looks up and notices who it was.
Unavaatu: [Shocked.] Impossible.
As it was Zakai as he opens his hands and we see a ball of light shining from his hands as he raised it to the sky. Cut to Ikki's point of view, via a telescope, where she notices Jinora in the light.
Ikki: Mommy, it's Jinora. She's ... beautiful.
Pema: What? Let me see. [Takes the telescope, gasps in surprise; shouting.] Be careful sweetie!
Zakai brings down Jinnira in front of Korra, holding with her a small ball of light. She opens her palms, releasing the light, which illuminates Republic City. Unavaatu, who is shielding his eyes from the glare of the light, stops bending, releasing Korra. As he recovers from the glare, a ball of light emerges from his chest.
Unavaatu: No!
Korra: Raava!
As Zakai then grabs Unavaatu in a full Nelson as Korra runs forward and punches Unavaatu before reaching into his chest. As she touches the ball of light, she pulls out Raava. She subsequently prepares to purify Vaatu.
Unavaatu: No!
After purification, Unavaatu dissipates into the sky in a golden light. Zakai and Korra bows in respect.
Korra: Go in peace.
As Zakai looks at Korra he smiles before disappearing himself as Korra grasps his hand before he completely disappears.
Korra: Thank you. Zakai.
Then Raava then flys over to Korra and warns her about the Harmonic Convergence.
Raava: Harmonic Convergence is nearly over. We must return to the Spirit World so we can fuse once again.
Raava and Jinora descend onto Korra's open palms, where she cups them with her hands for safety, before teleporting away.
The Spirit World
Cut back to the Tree of Time, where everyone was forced to retreat into the hollow. The spirits soon swarm the hollow, darkening the interior. Cut to a far shot of the spirit portals, where a beam of light descends from the center, illuminating the Tree of Time and dissipating the dark spirits. Cut to an aerial shot of the Tree of Time, where Korra's projection has returned. She opens her palms, releasing Raava and Jinora, who glides to her father.
Jinora: I'll see you soon, Dad.
Tenzin reaches out for Jinora, but she disappears before he could do so. Korra's projection also dissipated and returns to her body.
The South Pole
Cut to the healing hut, where Jinora awakens from her coma. She turns to smile at Asami and her grandmother. Katara approaches her and gave her a hug.
Jinora: Gran-Gran, I missed you.
Asami: What about Korra and the others?
Jinora: Don't worry, they're all right. Korra saved the world.
Tonraq and Senna hug each other in happiness.
The Spirit World
Cut back to the Spirit World where Korra walks out of the Tree of Time to find her allies and Raava waiting. Raava flies toward Korra, allowing her to hop and, and subsequently soars to the overlapping portals. Korra reaches out for the portal, which releases yellow bolts of energies from the overlapping portals. As Harmonic Convergence passes, the portals separate again. Cut to a shot of Earth where the spirit lights retreat. Cut back to the Spirit World where the portals now stand upright. Cut to Korra, who glows blue with a white imprint of Raava on her chest, before descending.
Tenzin: The Avatar Spirit has returned.
Korra descends back to the ground, using an air spout to slow her fall. She opens her eyes, which glow momentarily before fading.
Korra: It's over.
Mako, Bolin, and Tenzin run up to Korra. Mako and hugs her.
Mako: I don't even know what to say.
Tenzin: You were amazing.
Bolin: [Excitedly.] And the way you turned all gigantic like that, wow! I just wished Varrick was here to film it! It would be the greatest mover ever. After the Nuktuk chronicles of course.
Korra: [Walking to her cousins.] I'm sorry about your father. But he was already fused with Vaatu. I couldn't save him.
Eska: It seems cousin Korra is under the impression we're saddened by our father's demise.
Desna: But I will not miss him at all. In the end, he became a deplorable man.
Eska: Agreed. But how will we explain this to mother?
Bolin: So, I was thinking. I'm not really a fan of a long-distance relationship thing, [Korra walks off.] so how about you move to Republic City with me.
Eska: I do not think it will be possible.
Bolin: [Somewhat disappointed.] Okay. Desna can come too.
Eska: I will not be joining you, Bolin. Desna and I must return home.
Bolin: But you said-
Eska: Eternal darkness was upon us. I became caught up in the moment.
Bolin: [Sadly.] Yeah. I guess I did too.
Eska: [Walking toward Bolin.] But, you will always hold the special place in the organ that pumps my blood. I will remember you fondly. [Places her right hand to her heart, while smiling.] My turtle duck.
Cut to Bumi who hears a chitter of a dragonfly bunny spirit from a distance. He turns to see a blue-colored dragonfly bunny spirit, Bum-Ju.
Bumi: Bum-Ju, you're okay. [Hugs Bum-Ju.] I missed you, little buddy.
Bum-Ju snuggles against Bumi. Cut to Tenzin and Korra who walk to the northern portal.
Tenzin: Now that you're bonded with Raava once again, are you also reconnected with your past lives?
Korra: [Sadly.] No. I think that link is gone, forever.
Tenzin: I see. Why don't you close the portals, and we'll go home.
Korra walks up to the portal and stretches out her hand. As she reaches for the portal, she relaxes her palm.
At Zakai's Body
We see Zakai floating in the void as he falls down gracefully into his recovered body. Cut to Zakai sitting up and looking around as he then sees Korra and Tenzin talking about the future.
Korra: Maybe I shouldn't.
Tenzin: What do you mean?
Korra: [Bringing her palm back.] What if Unalaq was right when he said the Avatar shouldn't be a bridge between the two worlds? [Clenches her fist.] What if Avatar Wan made a mistake when he closed the portals? [Bum-Ju fetches a stick for Bumi, who in return strokes its head.] What if humans and spirits weren't meant to live apart? [To Tenzin.] Well, what do you think I should do?
Tenzin: [Placing his hand on Korra's shoulder.] I think you should trust your instincts. There is nothing else I can teach you. You are the Avatar. Whatever your decision, I support you.
???: So will I.
As Zakai walks up to Tenzin and Korra, she looks shocked as well as Tenzin as Zakai was back from beyond the grave.
Zakai: Hello Korra
Korra didn't care if he was a Spirit or human she immediately knew that he was the real Zakai as she had tears in her eyes and hugged him tightly as he returned it back.
Korra: [Tears streaming from her cheeks.] I'm so glad you're back.
Zakai: Me too.
As Tenzin watches this he immediately knew that wherever the Avatar goes, she won't be alone, as long as there is one or two. Both Avatars are destined to meet and go along a journey together and bring at least peace to the world.
The South Pole
Cut to the South Pole where Team Avatar exits the portal. Cut to the exterior of the palace where a large crowd has congregated. Cut to the interior where Mako approaches Korra.
Mako: [Softly.] Hey, can we talk?
Korra: Of course.
Mako: There's something I've been wanting to tell you about that fight we had. I know I said it wasn't that bad, but, that's not exactly true. I, um ... I-I want to know what exactly is Zakai to you?
As Korra looks at the ground she remembers all the adventures she went with him Or fought against him, she honestly feels that Zakai gets her more than Mako does with her.
Korra: I am sorry Mako. But, I think I'm in love with him.
Mako: [Looks away.] I know. I think I've always known.
Korra: You did? I'm really sorry I didn't mean to––
Mako: That's okay. [Holds Korra's hand.] I think we've both known we weren't supposed to be together.
Korra: Why didn't you just tell me the truth in the first place?
Mako: I know I should have, but ... I didn't wanna you to get hurt all over again. I guess part of me wanted to get back together with Asami.
Korra: I think we both know that this. Us? Doesn't work.
Mako: You're right.
Korra: It's over. [Cut to a frontal shot of Mako's sad face.] For real this time. [Mako nods.]
Switch to a side shot. Korra places her hand on Mako's cheek to guide him in for a soft kiss. As they break their kiss, they remain close together with their foreheads touching and their eyes closed. Korra sheds a tear, while standing there in a moment of silence. They open their eyes and stand erect once more.
Mako: I'll always love you, Korra.
Korra: And I'll always love you. [Walks off.]
Bolin: [Sliding toward Mako.] You want a hug?
Bolin awkwardly hugs his brother. Cut to the exterior of the palace where Korra is making a speech, with her parents and Avatar Aang's family standing behind her.
Korra: The war of the Water Tribes is over. Unalaq has been defeated, and the Northern fleet is returning home. The Water Tribes will always be allies, but the Southern Tribe is now independent, [The crowd cheers.] and the Southern Council of Elders has appointed my father, Tonraq, to be your new chief! [As Tonraq walks up to greet the audience, he is greeted with thunderous cheers.] I've realized that even though we should learn from those who came before us, we must also forge our own path. So that is why I've decided to keep the portals open. Humans can now physically enter the Spirit World, and spirits will be free to roam our world. I will no longer be the bridge. Humans and spirits must learn to live together. My mission will always be to use Raava's light spirit to guide the world toward peace and balance. Harmonic Convergence has caused a shift in the planet's energy. I can feel it. Things will never be the same again. We're entering a New Age.
Pan to the sky, which is filled with spirits literally dancing in the sky. Bum-Ju flies toward the camera before flying off.
After the Speech; the Healing Hut
We see Zakai in bandages as he is half naked. He is relaxing as his back is being treated for Unalaq cruel lashes.
As the water tribe tries to heal him but nothing could heal it not even spirit water. He will forever have those lashes for the rest of his life as he was resting he received an unexpected visitor.
Zakai looks up and sees Korra as the two smile.
Zakai: So? How is the big hero that saved the free world, again?
Korra: [Chuckles.] Well, feeling good. How's your back?
Zakai: They are going to be healed but the lashes will remain their, Unalaq was really keen on whips.
As the two remain quiet they talked to each other at same time.
Korra and Zakai: Can I say something?
This caused the two to awkwardly laugh.
Korra: You first.
Zakai: [Quickly.] No, no, no, [Normal.] you saved the world you get to speak first.
Korra: Ok, here goes. I broke up with Mako.
Zakai: Really? But I thought?
Korra: Yeah. I thought so too. But being away from him and learning about myself, I guess I figured that me and Mako would never work.
Zakai: Oh, I'm sorry.
Korra: So what did you want to talk about?
Zakai: Remember when I was trying to save Raava and give her back to you?
Korra: Yeah.
Zakai: Well after I died Jinora saved me.
Korra: Jinora? She saved you?
Zakai: Yeah, and there was this ... Gray Spirit that looked like Raava and Vaatu.
Korra: Really? Tell me more?
Zakai: It wasn't like looks either. It was almost a familiar presence with that spirit like really familiar.
As Korra was concerned about Zakai she seemed more concerned with this Gray Spirit he has been talking about.
Korra: Did it do anything?
Zakai: Well, it tested me and then went into me and everything is pretty much blank after that. Then the last thing I remember was waking up in my healed body and talking to you and Tenzin.
Korra was now very much curious about the Spirit that Zakai in question gave to her. If there was another Spirit that looked like Raava and Vaatu then how come they never even heard of it before now...
A/N: That was interesting there is a Third Spirit out there and now Korra is back to being single. Find out more about The Legend of Korra and Zakai in the next book.
Book 3: Chapter 1: A Breath of Fresh Air