Ken95 I have a cliche idea but might work. A kid that watched his family being killed and grew up later and trained hard to avenge his family, met a guy in a few chapters and
explained that their family were killed because of possession of great power which is "him" and his family successfully saved him. The "guy" he met trained him to fight and to find a man to kill and obtain information regarding the killer but later on he discovered that the "guy" who trained him was the one who killed his family for power and now they clash using their own powers equal powers.
Plot twist: The "guy" (who trained him) also has power and it is equal to the kid's family(clan) but since ancient time, no one ever settled who is stronger until that day they(enemy) had an inside man to collect information regarding the kid's family. Also, the "guy" wanted the other clans powers, so that he can combine it with his own to rule the world.
Now that I think about it. It isn't cliche anymore.
You can make this in a week if you work 12 hrs a day.