奥義

1. Origins, structure, and basic meaning

• Structure: Written 奥義 and read おうぎ, it is a school's deepest secret technique, or an ultimate move in fiction and games.
• Basic usage: It is passed from a sword master to a disciple and learned by a game hero after training.

2. Common pitfalls and similar expressions

• Secret mastery rather than ordinary tip
  • The word suggests advanced knowledge reserved until substantial training has been completed.