Related Clues:
- Understood by very few
- For initiates only
- Known by only a few
- Understood by a select few
- Like secret rituals
- Understood by only a few
- Difficult to understand
- Known to few
- Secret, mysterious
- I set core up to be mysterious
- Mysterious, secret
- Mysterious and secret
- Privileged or confidential among coteries
- Mysterious or secret
- Abstruse or mysterious