Spiderlings are level 20 insects with 2548 HP.
They fire a web which snares you for 5 seconds. You can counter this by running to avoid the web. If you are snared, then once the effect expires you will be immune to further snares for 15 seconds.
- Kill 12 of them for  Protecting The Clutch
- During the quest  Up To No Good you need to collect 6 Spiderling Eggs
- During the quest  The Favored Sheet you need to collect 10 Spiderling Spinners