Possessed Town

Design a story where an entire town gets possessed in a satanic ritual, what is the aftermath and how do inhabitants deal with it?

The nuances in this prompt revolve around the supernatural phenomenons post-possession and the inhabitants’ response. Do the townsfolk rally together or accusatory fingers start pointing? Are there inhabitants immune to possession? Who started the ritual and why? This encourages exploration of dark themes, societal dynamics in crisis, spiritual warfare, and the concept of innocence and evil.