The Story is rated T JUST IN CASE, since this is my first fanfiction i don't want there to be any problem. By the way I don't own Avatar Aang/Kora. Hope you enjoy.

Prologue:

This adventure takes place in a time where humans had forgotten all there was to know of the spirit world. This included bending. No more were humans able to command fire with their emotions, or water with their inner peace. Air benders were lost to the legends and benders of the earth to fairy tales. The spirits were angry, their homes were destroyed and they were forgotten. The lush greenery that used to surround villages had disappeared to be instead replaced by the greyness of pavements. Water had turned brown and forests had disappeared without a trace. The air was thick with fumes and the sky no longer blue, but covered with constant brown blankets that the wind had no control over.

Without the balance, it was a simple matter for evil to escape the cages where It had been locked up, it was easy for It to use the weakened minds of the angered and forgotten spirits and twist it to the point that blood was all they thought about.

The few spirits which were still sane were aware that the Avatar, master of all four elements was the only one that would be able to stop this imbalance and make everything better. But the cycle of rebirth had been broken and the Avatar was lost. No one knew who the container of the spirit was and neither to which people he or she belonged. Not that it mattered; it had been a long time since the four separate nations had ceased to exist; now they were only one people.

It was around 1000 years after Avatar Aang that the separation between the Spirit World and the human world weakened, and all hell broke loose on earth. In the past, weak and disinterested spirits were not or did not travel to the human realm but now with the evil in their minds they all arrived to Earth destroying homes and killing any human they could lay their fangs or claws on. The spirits were only able to do this because It was helping them. It had taken advantage of the Winter solstice, the day when the human and spirit realm were closest.

12 years after the initial attack, the size of the human population had halved and they did not dare be out at night, for that is when the spirits and the evil were strongest. Most of the population lived in huge ancient cities (such as Republic City or Ba Sing Se) that, for some unknown reason, were able to defend themselves against the spirits. The sane spirits, which were very few in numbers, tried desperately to find the Avatar, but much to their regret they were not able to.