Ashley, a beast within

Centuries ago, a king struck a deal with a demon in order to win a war against an enemy state. As the deal stated, the demon helped the king win the war, using a creature known as the warbeast and other demons but the king refused to fulfill his part of his deal which stated that he had to give up one quarter of his kingdom to the demon. Angry, the demon alongside with the war beast and other demons started to cause chaos in the kingdom and so priestess Luciana had no choice than to seal them up in a cave. But that wasn't the end of it. The priestess knew quite well that they were going to come back. However, she also knew that the saviours who would save them all from those creatures would be born by then. Four centuries passed and the saviors came but they were unprepared and so they died while fighting the creatures and again, the preistess had to use her powers to seal them up. Another four centuries had passed. It was now the 21st century. The world had changed and the saviors had been recarnated again, but will they be able fulfill their destiny this time? Will they be able to defeat the creatures?