Phase Spider Carapace

[Thorny]

So I've spent the last week parked in DN trying to get one of these to drop. So far I've killed 140 of the spiders with no luck. The majority of the spiders I've killed have been from near and around the zone in area. From the research I've done it seems that any spider can drop the carapace. Can anyone confirm this from experience here on P99?

If I had known it would take this long, I would have just farmed the coin to buy one, but these spiders have made it personal. Plus the xp is decent. I really want to ride this out and finish what I've started, but I want to make sure I'm not handicapping myself by mainly killing the entrance area spiders.

Any advice would be helpful!