Magic/Technology System Designer

I'm creating a [MAGIC SYSTEM/TECHNOLOGY] for my [GENRE] world.

Core concept: [YOUR BASIC IDEA]

Help me develop:
- Clear rules and limitations
- The cost or consequence of use
- Who has access and why
- How it shapes society and culture
- Common vs. rare applications
- How it could be misused
- How it connects to the story's themes
- 3 specific examples of it in action