Taking Franz's fascination with dark magic further

No idea if it’s possible but, as Franz has a tendency to bring dark magic into stories it’d be interesting if certain spells were marked as ‘Dark Magic’. So the existing 5e spells that are appropriate for this, inflict wounds, finger of death, animate dead etc would be considered dark magic, and a toggle in the custom spell creation UI to set if a spell is considered dark magic. And in campaigns franz could detect the player using these dark magic spells and give appropriate responses. Possibly the same could be done with items.