Do You Regret It When You Find Out That I Am a Heavenly Master?

No male protagonist + big female protagonist + heavenly master + five thunder methods + female protagonist alliance System: "It has been detected that you are the most domineering girl in the world, so I chose you to be the host of this avatar system." The purple-robed Heavenly Master Ma Xiaoxiao accidentally awakened the system when he was fighting a thousand-year-old demon to the death. But what she couldn't understand was, what was the substitute system? Ma Xiaoxiao: "What is the substitute system? What are you replacing?" System: "Of course, I will fight back on behalf of the girls who were bullied." Ma Xiaoxiao: "Then do you know what I do?" System: "I don't know. Who are you?" Ma Xiaoxiao said: "I am a purple-robed Heavenly Master, and I only know the Five Thunder Techniques. Do you want me to be a thunder substitute and kill those people?" System: "It doesn't seem impossible, but before killing them, they must first regret it, so that you can get rewards." From this day on, in this world, it often turns from sunny to cloudy, with thunder in some areas.