It had been a month since he came back and he had gotten more control of his avatar state. It would still start to get to him but would remind himself he had his family and friends. He got along with Appa jr. fine and would ride him to get some air without his glider to relax at the same time.

He was outside with Zuko and watching the sunset.

"I can't believe it's been a month since I came back. It felt weird enough being trained with three teenagers that are barely older than me, well physically I guess." Aang said shaking his head.

"Yeah, I'm still surprised you agreed to let me join you four after hunting you." Zuko said.

Aang opened his mouth but saw someone, it was Roku.

"I'll be right back." Aang said.

He didn't like the look on his face. So he went into his room and got into his position and went into the spirit world.

"Is something wrong Roku?" he asked him.

"Vaatu is back and because the spirit world and the human world are together you need to stop him." Roku said.

"WHAT?! But how can he come back?" he said.

"Not even Wan knows how. But this is going to be hard, but since you are fully realized you should get it." he said.

He stared at him and was nervous.

"How am I gonna do it? I mean, Ozai and Azula were easy after a bit, but I've never fought a spirit before!"

"I know Aang, I know but you'll figure it out because Raava is part of us and can talk to us."

He nodded his head and said, "Now let's hope I don't get killed or ready to pass out if I go to the avatar state."

"Good luck Aang, you can do it."

As soon as he got back he sat there for a second and went to find Korra.

"Korra, come here for a second."

She was confused but nodded.

When she got there she asked him what was wrong so he explained what was wrong and that he was going to put the spirits away.

"You have to try and fight him? But how, I couldn't do it." she said.

"I don't know how I'm going to do it but I'll think of something. Now I need you to get everyone somewhere safe."

She nodded her head and ran to get everyone and find a safe place.

While she did that, Aang looked for Vaatu. When he found him, he took a deep breath and walked over to him.

"Looking for something Vaatu?" he asked.

"Why yes I am sir, where is Raava do you know?" Vaatu asked.

"Right here." he said.

"Oh, I thought the avatar was gone?"

"No it isn't, and never will be. The avatar will never end." he said and aimed Vaatu with fire.

Vaatu tried to get Aang with energy beams but he used his air glide and took a deep breath and made him fly away.

"Well, as young as you look you are quite the avatar." he said.

He got a hold of Aang's leg and had him fly into a door.

"Ow." he whispered.

Aang was starting to get sore from getting hit so many times.

"Is something wrong avatar? Are you hurt?" he asked.

He looked up and took his hands off his sides.

"N-no! I'd do whatever it takes for me to get rid of you!" he yelled.

Everyone was nervous especially his family. He was using earth right now and got him trapped after that he used something he very rarely used, lightning. Vaatu then had him flying around and this time even Aang couldn't get away from the air.

Then again he was in so much pain he was having trouble bending.

'Alright that's it, Raava can I get into the Avatar State?' he asked.

'Of course you can Aang go right ahead.' she said.

'Thank you.' he said back.

He closed his eyes then he opened them and had them glowing. And he had every element get around him. While he was trying to get him with earthbending he got his tail hard.

While he was fighting him he was using more than one at once. Then Vaatu got his back where his scar was. Aang had to fight it hard from it getting scratched deep.

"You are quite strong for your age avatar." Vaatu said.

"I was trained years ago." he said with the other avatars in him like he did with Ozai.

While they fought Katara, Toph, Sakka and Zuko were having a repeat of the fight he had years ago.

Another energy beam was aimed at him but missed by an inch. Then Aang aimed some ice at him. While they fought Aang was getting tired after using so much power and being in the avatar state so long.

Finally Vaatu was trapped in between the tree he was locked in years ago.

"Vaatu, spirit of chaos, you are to be trapped in the Tree of Time for ten thousand more years." Aang said while covering him with all four elements.

After that he got out of the Avatar State. When he got out his knees gave out on him and everyone ran to him.

"Aang, are you ok?" asked Katara.

"Y-ye-eah, I'm f-fine. Just sore. Deep scratches, bruises and the scar on my back deep. At least I had more control of my avatar state and not a repeat of the beginning and a few weeks ago." he said shaking.

He was in a lot of pain from the fight he just finished.

'Aang, if your wife Katara gets you right where you got your scar from Azula years ago it should help a bit.' said Raava.

'Ok.' said Aang.

He tried to get up but he couldn't. He looked at Katara.

"Raava said that if you get me in the right spot where my scar is from Azula you can heal me a bit."

She smiled and nodded her head.

"Can you get up or airbend yourself up?"

He shook his head.

"Alright, I can do it here." she said.

"Then I'm putting this to the spirit world again." he said.

While she did that it hurt. When she was done he tried to stand up and just barley he could. So he used his Avatar State for a second and replaced the spirits. After that he was too weak to do anything and passed out.