My readthrough of WoT (**Spoilers**)

[Renoard]

Arhihol (arid hole) is important in fact critical to the plot.  But you won't see it for a while.  You can pretty much assume that Jordan does spend much ink on waster characters or settings.  If he takes the time to introduce you, you'll probably meet again.  That's just a rule of thumb.

You've really only scraped a thin veneer off the zoo of creatures that he uses.  But they tend to fall into categories in ways that keep them from seeing overdone or busy.