RPGs are all about letting players undergo the hero's journey (or descent into villainy), and part of that journey is facing off against a major adversary. The main villain in most RPGs can come in several different forms. In one case, they can serve as a mirror to the main protagonist, showing us what may have happened if our character followed a different path. Another main villain could be a major lore component, one that explains why the world your character inhabits is the way it is.
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