Lightning Crusader

Long ago there was a group of people that protected of person called the Lightning Crusader.
This person is said to have the most powerful abilities ever. Legends told that a child would be born as human, but have abilities of other creatures from different planets or realms.
The people that guard the creature were known as the Nine of guardians of aurora
Each one of them had one element until one of them Eragon used his element to bring the Hellgate back after it was destroyed; Now since the Hellgate has been reborn, the Gate will reopen for the army of darkness to conquer Aurora, and now it’s up to one person to do and save humanity and maybe the Nine Realms of Aurora.
If not then the world will be plunged back into darkness and the nine realms will be destroyed.