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Low-light Vision

You have eyes so sensitive you can see twice as far in dim light. You can see outdoors on a moonlit night as well as you can during the day. Low-light vision is color vision. Low-light vision has no effect on bright light.

Mechanically, light sources have double their dim light for characters with Low-light vision.

For example: A torch has "bright light in a 20-foot radius and dim light for an additional 20 feet." A character with Low-light vision would see bright light in a 20-foot radius and dim light for an additional 40 feet.

Dom says...

This is extra work that's usually not worth the effort, unless you have a virtual table top that can do it for you programmatically. There's a reason it was removed from subsequent versions of very popular RPGs.