DnD campaign idea: Why was the town infected with the Dualysis Disease?

Hi! I'm Dougie. I'm a dark fantasy illustrator and the creator of the ShadowMyths cards. The cards are used for Oracle/Tarot reading, DnD Campaign Ideas, Writing Prompts, and Therapy.
This disease card is called Dualysis. I give you a short campaign idea based on the card and how you can use it in your DnD or RPG game. I also use these monsters and diseases in my short stories.
You can learn more about how to use the cards at www.shadowmyths.com/
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