I'm know as the weakest Karmic user

Around 1000 years ago a meteor crashed into our planet and started releasing energy called karmic energy also known as karma. beings known as irregularities invaded the earth and couldn't be defeated by normal means. so they used karma people who could use karma went to [Neraphim Academy] to control weapons such as sword or guns to fight the irregularities our mc has the lowest power score in the history, but what happens when he meets a mysterious orb that has near infinite Karmatic energy.