The Master of a Thousand Masks

About to die of old age, Evan York was captured by a Demoness to be used as a 'tool' for her cultivation. He unexpectedly awakened the [Negative Reversal System]! Poisons become tonics, and demonic arts turn into divine skills! Not only was he not drained dry, but he was revived, rejuvenated, and achieved the strongest Heavenly Dao Foundation! Looking at the dumbfounded Demoness, Evan York smiled, 'You wanted to use me for your cultivation? Now, it's my turn to call the shots!'