Monochrome monitors, 300-baud acoustic coupler modems, DECsystem-10, EDLIN, SOS/RUNOFF.
In addition to _Adventure_ (it had a lethal “book of exploding runes,” did it not?), I remember playing a game called _netTrek._
Maybe there are some things about the late 1970s that are nostalgia-worthy…
Naw.
In this (early?) version of ZoL, there is nothing dangerous, but if we were to add a mysterious monster, it's name would have to a something like "grepha". (At least, I assume that "grue" is from "GReat Underground Empire"...?)