Darkvision in D&D and GURPS, or How does Infravision work?
There is one ability that is present on most
monster statblocks in D&D – darkvision. In my opinion, it is overused, as
often there is even no justification for why would the creature in question
ever need darkvision. For example, let’s check D&D 3.5 Monster Manual – I
counted 377 monsters total, and do you know how many of them have darkvision? 239!
That’s roughly 63% of all monsters. And you should keep in mind that the first
Monster Manual contains many mundane animals, so for the other Monster Manuals
this percentage is probably higher. But anyway, it seems to me that darkvision
in D&D is not a special quality – the lack
of darkvision is a special quality.