[to Raava and Vaatu] Stop, or you'll destroy everything!
Raava
This doesn't concern you, human!
It does when the lives of spirits and animals are in danger!
If you are a friend to the spirits, then use your fire to help me break free!
Raava
Don't involve the human! This is between us!
[frantically] Please! Save me! She has tormented me for ten thousand years!
Ten thousand years? [attacking Raava] Let him go!
[Wan weakens Raava's grip on Vaatu. Raava swats the young man away. Vaatu pulls further from Raava, until only one tendril holds the two spirits together. Wan, recovering, sees this and uses his firebending to separate the two spirits. Vaatu flies away from Raava, and stands atop a nearby mountain to address Wan.]
Thank you, human. You have preformed a great service for the spirits. [Vaatu flies away]
Raava
[to Wan] Do you realize what you've done?!
Yeah. I helped a spirit who was being bullied by you!
Raava
You are gravely mistaken. I was keeping him under control.
And what gives you the right?
Raava
You don't even know who I am, do you?
Raava
Yes. My name is Raava. That spirit you freed is Vaatu. He is the force of darkness and chaos. I am the force of light and peace. Since the beginning of time, we have battled for the fate of this world, and for the past ten thousand years, I have kept darkness under control and the world in balance. Until you came along.
So, by freeing Vaatu, I let chaos into the world?
Raava
Precisely. The human and spirit realms are heading toward annihilation, and it's all your fault.
[cut back to Korra in the present day]
[quietly] Raava, I found you.
The Harmonic Convergence is about to begin! The Era of Raava is over!
[As the Harmonic Convergence begins, Wan fuses his soul to Raava's spirit, becoming the first Avatar]
Raava
We are bonded forever.
[Entering the Avatar State, Wan makes quick work of Vaatu, trapping him inside an elemental sphere and imprisoning him within the Tree of Time]
This is your prison now, and I will close the portals so no human will ever be able to physically enter the Spirit World and release you.
The spirits must stop fighting with humans and return to their home in the Spirit World. I will teach men to respect the spirits so that balance will be maintained. I will be the bridge between our two worlds.
LTLion Turtle
The world is entering a new age. Our time protecting mankind is over. We will no longer give humans the power of the elements.
Different groups of people must learn to live together. This is my mission: to use Raava's light spirit to guide the world toward peace.
[At the end of his life, and elderly Wan is lying alone on an abandoned battlefied and has one last conversation with Raava]
I'm sorry, Raava. I failed to bring peace. Even with Vaatu locked away, darkness still surrounds Humanity. There wasn't enough time.
Raava
Don't worry, we will be together for all of your lifetimes, and we will never give up. [Wan dies, and a glowing wisp leaves his mouth. The screen fades to white and a baby is heard crying.]
[Cut back to Korra in the present day. Her eyes glow white as she briefly enters the Avatar State and wakes up.]
FSFire Sage
Do you know who you are?
My name is Korra. I'm the Avatar.
Raava
Korra this fight is not yet over.
Raava
Yes Korra
Vaatu cannot win. So do not give up!
RRoku
Do not give in at all costs!
KKyoshi
Do not give in to 10,000 years of darkness and chaos.
RARaava, and all past Avatars[all together]
For you are the one true Avatar!
KWKorra[with Raava's voice encompassing her own]
Darkness cannot win. You cannot win!