Disclaimer: I do not own Harry Potter or Fairy Tail.

Summary: When everyone abandons Harry after his name comes out of the goblet he's had enough. He goes to the seventh floor and finds the Mirror of Erised in the Room of Requirements. His desire to escape and magic react with the mirror and send him to Earthland de-aging him and changing his appearance at the same time. He becomes the Poison Dragon Slayer Cobra. AU for Fairy Tail. Rating to be safe.

AN: Touches briefly on his time at Tower of Heaven then diverges from the story with him going to Fairy Tail after having the dragon lacrima implanted in him by Brain. Not wanting to be a tool for Oracion Seis. Before going to Fairy Tail he will find the real Poison Dragon and get training from her making Cobra a 3rd generation Dragon Slayer instead of a second Generation. He will also give up his right eye sooner so he has full potential with his Sound Magic.

Harry couldn't believe it. Not only had someone put his name in the goblet and spelled the goblet so that he would come out, as a fourth champion but no one would believe that he had not done it. Even his friends wouldn't believe him.

He growled in aggravation as he paced back and forth in front of a blank stretch of wall on the seventh floor thinking that he needed to get away from everyone. He stopped as a door appeared and entered finding himself in a large stone chamber not unlike the last chamber for the Sorcerer's stone in his first year. He saw the Mirror of Erised in the room against the back wall.

He walked towards it with his desire to escape everyone at the forefront of his mind. He paused for a moment as he saw the surface of the mirror rippled. Deciding that whatever was going on with the mirror was better then dealing with his so called friends. He stepped closer to the mirror and brushed it with his hand. As he did he was drawn through the mirror and found himself falling through space. He noticed some changes happening to his body before he passed out.

When Harry regained conscience his head was pounding. He brought a hand up to his forward and paused as he saw strange cuffs on his hands. 'Weird where did these come from?' He thought. He then examined himself and noticed that he was smaller, and most likely younger, and that he was wearing ratty old clothes. Oddly the only thing that borrowed him was the strange cuffs. Before he could ponder on this any more he heard a hissing voice wondering how to get out. He looked over and saw a small purple snake with a cream-colored underbelly. "Come here beautiful I won't hurt you." He hissed to the snake laying his right hand on the ground.

He had never seen or heard of a snake like this one before. The snake paused as it heard him speak in it's own language. "You are a speaker? I did not know any existed." The snake hissed moving to his hand. He could somehow tell this time that the snake had a feminine voice letting him know she was indeed female. As she slithered onto his hand he lifted her up closer for a better look. He also took a moment to look around and noticed that they were in a stone cell of some kind. Things also didn't feel as familiar as they did back home.

"I don't know if speakers exist here but they do in my world. Though it is a very rare trait. Do you have a name?" He asked the snake shaking her head in reply. He thought for a minute before coming up with a couple names, one for the snake and one for himself. "My name is Cobra. Yours shall be Cubellios." He said receiving an affectionate lick from the now named Cubellios.

Cobra and Cubellios would end up spending a year in the Tower of Heaven under Jellal until Brain came to recruit him and five others into his guild. After undergoing excruciating pain having a dragon lacrima implanted in his body Cobra and Cubellios managed to escape the lesser guild that was under Brain's control. The duo using their poison to escape being captured again.

Cobra managed to make it to a cave a good distance away from the facility in the mountains before the residual pain of having the Lacrima placed in his body took effect causing him to slide down the cave wall. "Kuso my body feels like it's on fire. Are you alright Cubellios?" He asked his companion who had been his only friend since coming to this world.

"Yes I'm fine Cobra. You should rest that ordeal you went through could not have been pleasant." She hissed wrapping around his waist gently like a belt. She had grown a bit though Cobra was sure she was far from growing. He had already figured out she was a magic snake of some type.

"A human that can speak the language of serpents in my cave how intriguing. Especially since your one that has my magic even if it is artificially obtained." Came an amused feminine hissing sound that also had some growls mixed in. Cobra and Cubellios both tensed as they looked towards the source. Cobra's eyes widened as he saw it was a large dragon with crimson scales and similar cream-colored underbelly as when he entered Dragon Force temporarily to use his newly acquired Dragon Slayer magic. Sense he did not yet know how to use his Sound magic offensively.

"You're the Poison Dragon aren't you?" He asked speaking normally knowing that the Dragon could understand it. He received a nod from her. "My name is Cobra and my companion here is Cubellios. Could you please help me master my Dragon Slayer magic?" He asked her.

"Yes I believe I can do that. My name is Chishi. I shall warn you now little snake this training shall not be easy and if you intend to master both Dragon Slayer Magic and your other magic you may have to be willing to give something up. Do you think you can do that?" Chishi asked him leaning her head down closer to him to look into his eyes which were now black rather then the green he had before coming here. He had also noticed that his hair had turned crimson though he was glad that his scar was gone.

"I already gave up everything once so I'm not afraid of giving something up if it will improve my chances of survival. Isn't that right Cubellios?" He said the last part in parsletongue so that his friend could understand him. Cubellios nodded her head knowing her master would willingly give up anything, besides her, to become stronger.

"Very good your training shall begin in the morning once your body has had time to properly heal." Chishi hissed so that Cubellios would be able to understand as well. Chishi was glad that she had a student though she had never originally planned on taking one.

AN: Ok since I know someone might bring it up yes I know that Brain gave Cobra that name. I know his real name is Eric but in this story I'm having Cobra's name be one Harry chose for himself as a way of cutting ties from his past. Right now I'm going to say Cobra is 12 since no definite age is given. He shall be 16 when his training ends and 23 when it reaches the start of the show. Therefore he is 3 years older then Cubellios/Kinana who he will be paired with later on.