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Attacking the darkness
(ttrpg.network)
For those unfamiliar with the Dead Alewives skit this is referencing, it's funny as hell: https://www.youtube.com/watch?v=-leYc4oC83E
You probably don't physically reach for GURPS Darkness because it's just a 17 page PDF, but those 17 pages are jam-packed with content including 6 distinct varieties of darkness.
Edit: I forgot that most GMs don't even use GURPS Darkness. If you go to the Steve Jackson Games forums you'll find a 15 year old discussion building darkness from scratch, ending with Kromm coming in to say he just runs it as a Ghost with Weakness(Light) and gets on with his day.