Thalenia's Comments

Got a rare as a secondary pet in Stonetalon while trying to find a rare venomspitter in Webwinder Hollow.  I didn't see many of them (1-2), and it took be about 25 battes to get the rare spider, so if you don't have any luck in the normal spawn spots, try there.

Haven't seen one at all until today (I don't farm it a lot).  Killed lots of exiles, but that didn't seem to help.  Finally had one spawn (uncommon), a few minutes after killing the 3 in the center and looting them...he spawned off to the north, by himself, before any of the center ones respawned.

It seems to be a simple random spawn...weather was clear / cloudy, nothing else I could see that would trigger them, so I'd think just keep at it and you'll eventually run into one.