[Sombre]

You're correct, it's an error in the avernum dm. Here is how to fix it.

Change all instances of 2170 in Avernum to 2797.

Then add this code to it.

#newmonster 2797
#copystats 1447
#armor "nothing"
#end

It's designed to give partial darkvision without getting a bunch of unwanted armour.

I'll update the files in the forums and let people know to redownload.