He developed Dissociative identity disorder otherwise known as Multiple Personality Disorder after trauma from the battle of Hogwarts and a brain injury. He believes at times that he is his twin brother Micah who passed at the battle of Hogwarts. Since Micah's body was never found it was easy for him to slip into his life. 

Mateo needed this, he needed a bit of reprieve from the constant chaos that brewed inside of his mind. He needed to try and reduce the side effects part of him wondered if aging himself would also age his mind. Give him that moment of relaxation he needed maybe make the blackouts less frequent. He didn't want to lose what he needed, so he spent the following weeks gathering ingredients and researching the best potions. He didn't need more trouble he just wanted headaches and blackouts to stop. He wanted to lose less time to the darkness and this seemed like the only solution with so much going on in the wizarding world.







Finally the day had come he had done exactly what was necessary following the recipe to a T. A few more years and he knew that he would have control over whatever this was he would be better but as he started on the last few stirs of the potion he felt faint. "No..." But before he could protest the world around him faded to black and when he awoke he was on the floor covered in a sticky substance his head throbbing furiously. He looked around noting at first that his hand was not like normal. He sat up and his dress robes barely fit, He barely summoned the strength to stand forcing himself over to the mirror before gasping in horror.







"HOLY....Sweet Merlin." His voice quavered as he noted the familiar yet 16 year old image of himself. "madre de dios..." He had to find a way to fix this and fast.