Dual Cultivation of Light and Dark Magic

Long Jiaoyang was a disciple of the Righteous Qi Sect with a heart for justice. Although one would expect the Righteous Qi Sect to conform to the Righteous Dao, the sect was full of corruption.
Long Jiaoyang was disgusted by this and decided to assassinate the sect master who had defiled countless female disciples. Although his assassination succeeded but was caught and sentenced to be crippled and expelled from the sect. He luckily managed to escape but fell into the sect’s forbidden area, however, not after his cultivation was crippled. As he was falling to his imminent demise, he was saved by the sect’s treasure stele, which was thought to have been lost thousands of years ago.
Although his life has been saved he won’t survive for too long because he’s severely injured and trapped in the forbidden area. As he was thinking of ways to get himself out of this predicament he finds out that there is an old demon sealed in the stele and when night falls, the seal weakens.