Leon was not a normal young man. He was extremely sick, a disease that caused him agony just to breathe, let alone move. As a result, his body grew fat, and his health declined to the point where he would probably only last another year.
When he opened his eyes, he was no longer in his bedroom, but inside a large cauldron. Priests and wizards surround the cauldron, while soldiers, knights, and nobility watch.
"Begin the ceremony! Drain him of his greatest power!" Shouts the Queen who looks on with hideous delight as he suffers in agony.
This world is not his own, but the power they steal is what was killing him. This world would forever curse the dark kingdom of Erat that fell that night.
It was their dark magic that brought to their world an existence that his own world cursed to prevent his eventual rise.
The rise of a being that would give birth to a Kingdom that would grind all others under its bootheel.
The rise of the Beast King.