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Related Clues:
- Cloud you can walk through
- Gothic novel trope
- Skyline concealer
- It reduces visibility
- Smoggy overcast
- Weather phenomenon that London is famous for
- Atmospheric driving hazard
- Unclear mental state
- __ machine
- 'Purple ___'
- Visibility-reducing weather phenomenon
- Non-magical source of invisibility
- San Francisco forecast
- It's like mist but with pollutants
- A thick one may be found in a bank