These little fellas had there spawn time reduced to six seconds. Though they do not drop spiderling silk remotely close to TSS Spiderlings, they sheer volume more than makes up for it.
I'm not sure if this is a bug or what... I farm the caves of these guys in the FoB for easy, lazy cash(As I can do other things on the comp while I do that) and as they were repopping, I turn out of the first room and one despawns infront of my face with this message:
a bonecrawler hatchling says 'Bah, you are not ready for this trial! your skills are weak and you are not dressed well for battle. Do not return and embarrass yourself further until you have improved yourself.'
Bug or what? There's a new npc in the zone due to the expansion, perhaps scripts are a little messed up... only when I hailed that fellow he spoke with an accent. Eh well.
Mobs assist each other, but only if the person killing the first mob is relatively low level. That's why groups often have a higher-level person pull even if they're not the best pulling class available: you can pull singles more often if you're higher level. So bonecrawler spiderlings probably wouldn't help each other when being farmed by someone to whom they're green, but they will help each other when four of them will be enough to kill the player character.
Loot drop. Spiderling legs, spiderling eyes, spiderling silks. Handy knowledge for newbies (these things do sell).
Additional note, there's a big old nest of these and the bonebinders at -296, +2638 in FoB. They don't aggro, and they don't seem to be inclined to aid each other. The worst I've seen off of any of them is feeble poison, which doesn't even seem to effect and Iksar at all (our natural regen seems to be a heck of a lot tougher than their poison).
They do gang up and help each other! I was almost killed by 4 of these little £$&%($% and i only attacked one! Its true about the feeble poison being practically useless on us iksar.
Chakrasis Knight of the 7th Season Crusader of the Greenmist