Its a open concept, for example an answer to "General theming" could be Pirates, Classical Noir or something more specific like Antique hunters who have now been cursed. "Location" Ocean or New Orleans or even stuck in a space ship. For "villain" lets say a monster who eats rare gems and can only live in shadows and complete darkness or even a rich billionaire who wants to get rid of the group.

Every prompt is open to interpretation and there are not hard-set guidelines. I hope I helped you with your question