Need to avoid making it too convoluted—keep the themes cohesive. Maybe set it in a fictional city known for its diamond trade, with a history of religious artifacts. The player uncovers a plot where diamonds are being used as currency in simony deals involving stolen relics.

Potential challenges include ensuring that the simony and diamond themes are well integrated and not clichéd. Also, balancing the intensity ("hardcore") with accessibility for casual players. The game might offer multiple difficulty levels for investigation tasks.

So combining these elements, the user wants a detailed feature description for a detective game that's stylish, intense, involves diamonds and simony themes, and is either innovative or a new iteration. The user might be looking for a game design document or a feature overview for a game that combines detective work with high stakes in a luxurious but corrupt setting.