Jack thunder and the cursed power

Prologue

Once upon a Time in a galaxy filled with magic and happiness there lived a very happy couple an elf and a wizard they had their first borns, twins one was a strong fire wizard, his name was Jack, the other could create anything made of gold, this one's name was Bill they lived normal lives for 6 years, Jack's power was extremely powerful for his age and Bill's was average. Then came the day, March 31st when the locked up darkness from hell broke out and rose like a black fog onto the planet, the demons killing left right and center the elf and the wizard were called in to fight the demons off, Jack and Bill begged their parents to not go, but they had to. The elf and the wizard had successfully defeated the demons, they were injured but nothing fatal so they went back home to rest. Once they reached home they all sat in the living room talking about what had happened, then suddenly a big hole of fire opened in the middle of the room, filling the whole room with immense heat and the smell of rotting meat. Then came out Lucifer the biggest of demons the elf and the wizard stood between the kids and the demon. Bill made a portal and got out of there the wizard told Jack to run so he ran and hid, then after a few minutes he heard his mother's scream he wanted to go but he knew he'd only get in the way, then he heard his dad's scream, he didn't know what to do so he stayed hidden in the closet and after what felt like an eternity he got out and slowly made his way over to the living room where he found his mother and father dead. His eyes filled up with tears then out of the corner of the room Lucifer came out and said, "Thank you for coming back to me Jack". Jack just looked at him in pure horror, then the anger and sadness and pain inside him all mixed together and he burst into flame he set the whole Castle on fire within seconds, but somehow Lucifer was still alive and with his last bit of effort he threw his knife at Jack hoping to kill him, the knife pierced through Jack's left eye then everything went black