冥界

1. Origins, structure, and basic meaning

• Structure: 冥界 is read as めいかい and can mean “underworld” or “realm of the dead”, depending on context.
• Basic usage: The examples show an underworld entered by a hero and a cave depicted as its entrance.

2. Common pitfalls and similar expressions

• Distinguishing senses and uses
  • It is the realm of the dead in myth, religion, or fantasy, not a physical grave or underground space itself.