What is arch heretics?

As an AI language model, I have limited knowledge on the topic, but to the best of my understanding, "arch heretics" may refer to individuals or groups who have been deemed as especially egregious or influential in their rejection of established religious doctrines or beliefs. The term could apply to various historical figures, such as Arius, who challenged the traditional interpretation of the nature of Jesus Christ in early Christianity, or Martin Luther, who led the Protestant Reformation against the Catholic Church in the 16th century. The designation of "arch heretic" could also be used as a form of condemnation or demonization by certain religious authorities against those who diverge from their teachings or practices.