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Name: Jason Zatara
Codename: Fate-Spawn 
Age: He was technically born three years from know, but has been alive 22 years, but was magically aged and de-aged a number of times. So, he age is a little complicated.  
Gender: Male 
Powers: Magic. Being the son of John Constantine, and Zatanna Zatara, who was Doctor Fate for most of the pregnancy, has given Jason a unique physiology that makes him uniquely gifted in magic. 
Weaknesses: Magic always has a cost. While his unique physiology lessens the cost of most spells, and he uses various artifacts and talismans to lessen the impact of said cost on his body, there is still always a cost. 
Personality: Jason Zatara is an interesting fellow. Having fumbled through magic for the last few years, meddling with motion magic and surviving a magical cataclysm has humbled Jason. He is far from the happy go lucky, flippant magic user, who was boarder line arrogant with his abilities. Now he is much more calm and collected. He is very much a fish out of water. He had relationships with people who don’t even know he exists, and he’s parents aren’t even together yet. All he knows is that the Justice League sent him back to try and stop the cataclysm, but they don’t know what what caused it, so have no real leads on how to stop it. Their only leads were an uptick in demonic activity in the current year. 
Brief History: Jason is the son of two prolific sorcerers. John Constantine and Zatanna Zatara. A short time after his conception, John was killed by demons, driving Zatanna to don the Helm of Dr Fate. Nabu would not release her for a whole year, while the unborn Jason was bathed in the magical energies of Fate. Nine months after Zatanna removed the helm, Jason was born. Named after John’s close friend, Jason Blood. Zatanna settled down, and tried to live a normal life. Jason grew up with a relatively simple life in a sleepy small town. It wasn’t until his twelfth birthday, when Felix Faust attacked his mother that he learned about the existence of magic. Once Felix revealed their location, more and more enemies made their way to the small town, and Zatanna decided to send Jason to be raised under the care of the Justice League. 
Fast forward ten years and he was working alongside Wonder Woman and Dr Fate as the leading experts in mystical threats to earth. That was when the cataclysm happened. Hades superimposed itself on earth, and wiped out 50% of all life instantly. Hordes of demons quickly overwhelmed the remain civilians, and weakened or killed most of the remaining heroes. The remaining heroes had managed to save Gotham under Dick Grayson’s leadership, but a new threat looms. A boom tube has opened above the arctic, leading to Apokolips. With Earth’s heroes weakened from their battles with Demons, they stand no chance against Darkseid and his Legions, so they played a Hail Mary. With the collective effort of the remaining heroes, Jason utilised experimental Motion Magic, to create a portal into the speed force. Guided by Bart Allen, he was sent back, with the remaining heroes stating back to try and hold off Darkseid. 
So, here awaken our hero, years before he was born, trying to find a way to give humanity one last chance.