The Fateful Night

A peaceful time is flowing across the earth. People are leading happy and peaceful lives. But, everything has changed from that fateful night. A group of dark shadows emerged in the sky and unknown creatures started to come out. They call themselves the "Cavles". They claimed that they were living under the ground the whole time and finally they have come above to the human world.
As soon as they came, they started massacring the people. Everywhere is violence and violence. People are torn apart and being cut in pieces. Smiling is a mere memory now. Beautiful lakes and lands are filled with blood. When terror was attacking the world in everyways, a light of hope showed up. A man with both powers and techniques to defeat the cavles made his appearance. This man started to perish all the cavles and in a few days, the number of cavles decreased by 70%. The remnants started hiding and didn't attack all the time.

In this meantime, the man with powers started sharing his techniques and landing his powers to the people so that they also can defeat the cavles and in a short period of time, a new military force stood. They maintain peace by defeating the Cavles. They call themselves the "Reaper's Guild '' But, on the other side, the cavle king along with his cavle army started evolving their powers.
After 15 years, a deadly war between the Reaper's Guild and Cavle Army took place and as a result the cavle army lost both the war and the king. But, at the end of the war, the cavle king's last word was tricky but also threatening as he said he will come back again. But, till now there is no explanation.