Pet Battle: [18-20] Blade's Edge Mountains
95% Hit Chance
Strikes at the enemy, dealing 433 Beast damage.
100% Hit Chance
Instantly deals 256 Beast damage and Poisons the target for 98 additional Elemental damage per round for 3 rounds.
Flings a sticky Web at the target, dealing 295 Beast damage and making it impossible to flee for 2 rounds.
Deals 197 Beast damage and coats the target in brittle Webbing , causing them to take 98 Beast damage each time they attack. Lasts 3 rounds.
Deals 197 Undead damage.
The user restores 197 health. Double if the target is Webbed.
Swarms the enemy with spiderlings, dealing 394 Beast damage.
Deals double damage if the target is Webbed .
Been farming this guy for 6 hours over 2 days. I've seen 13 rare basiliks & countless rare squirrels, rabbits, rock vipers and even 2 rare brown marmots. I've encountered over 100 skittering crawlers & not one rare. I've found them as seconds to every battle pet in every part of the zone, numerous times, and even found around a dozen as primary pets in the tunnels, no rares.
Update: posted this, logged in, & first pet (squirrel) I encountered had a rare spider!
Haven't seen any in the cave down south yet, but I did just have one come up as an extra pet when fighting a rabbit. Unfortunately it was a poor, they all have been so far.
I got 3 rares as adds while trying for the Scalded Basilisk Hatchlings - the only rares of this I ever saw. If nothing else, they seem much more common as adds to the Hatchlings than anything else I tried in the zone.
Found lots of these as 2nds to the Cogblade Raptor near Death's Door. Got my rare there.
Spent 2-3 hours looking for a Rare via the Scalded Basilisk Hatchling, but only saw Poor - Uncommon :(
Ventured out to have a look at Rock Vipers based on the other comments, and finally found a Rare Skittering Cavern Crawler as a secondary to a Scorpid :)
Found mine in the cave between Zangermarsh & Blade's Edge. Snagged myself a rare on the first go-round! About 12:35pm server on Whisperwind. Good luck, y'all!
EDIT: Okay, I've seen like 7 of these now and 6 of them were seconds to the Scalded Basilisk Hatchlings. The first 5 of those 7, including the one I captured in the cave, were rares. The 6th was poor and the seventh was Uncommon. I was beginning to think they were ONLY available in rare (ha!).
Found one on my second squirrel, and the first squirrel had a rock viper
i can confirm Foonbaba's statement:
often found as secondary pets when fighting scalded basilisk hatchlings
I found this one twice as secondaries. One to a rabbit, the other to a squirrel. So aparently they can potentially come from any battle.
Rare farming this pet, found one in the cave as the named battle pet Skittering Cavern Crawler that connects Zangermarsh and Blage's Edge Mountain and two more in the other cave at that does the same thing, but they were only common and below.
So I took the advice to kill anything in the zone and I seen they come up as a second to the Rock Vipers, Scalded Basilisk Hatchings,but you will never find one on any Rabbits or Squirrels.
But I finally found 3 more in that same cave after doing a run of the zone and finally ended with what I came for.
I have yet to see this pet by itself, but it frequently came up as a second on the Scalded Basilisk Hatchling - often the second and third pets would be the spiders.
I easily found them in cave which connects Zangarmarsh and Blade's Edge Moutains (Road from Orebor Harborage to Sylvanaar).
These often spawn as a secondary battle all over BEM.
i found one as a second combatant against the scalded basilisk crawler just above gruuls lair if this helps