How evil is my oc Nexo (16 years old)

My OC killed 500 million chinese civilians, monks, children, soldiers etc. And did this as a warning to Mao zedong after he got tortured at the age of 14, when he gains full omnipotence he will put Mao in his own personal hell where he increases a tetration of infinity heat and each power increases, the moment Mao enters this hell his vocal cords will break so he cant scream, now we are getting close somewhere, and thats it