After Destroying My Own Cultivation, I Reached Supreme Status Through Demonic Cultivation!

I transmigrated into an orthodox immortal sect, only to awaken a System that could make me stronger by absorbing demonic energy. I thought I'd never get to use the System in this life. But then my beautiful master brought back a junior brother from the battlefield against the demons. His parents had both been killed by the demons, so everyone in the sect went out of their way to care for him. I treated him sincerely, too, and looked after him with great concern. One day, I accidentally discovered that he had somehow stolen the sect's supreme treasure, the Mystic Heaven Pearl. Taking pity on him because his parents had died at the hands of the demons, I simply retrieved the treasure and didn't report him to the sect. I never expected him to accuse me first, framing me for colluding with the demons, and