For the quest "The Black Shield" (the part where you need 5 Acidic Venom Sacs) appears to be broken in the new core. I've done it on previous characters and seen a decent drop rate - currently they don't drop at all. I killed about 30 spiders and didn't get a single one - whereas on my other characters it was roughly a 1 in 4 drop rate.
For the quest "The Black Shield" (the part where you need 5 Acidic Venom Sacs) appears to be broken in the new core. I've done it on previous characters and seen a decent drop rate - currently they don't drop at all. I killed about 30 spiders and didn't get a single one - whereas on my other characters it was roughly a 1 in 4 drop rate.