So I was lurking around the new update testing some stuff, when I came across this:
Yep some sort of cobweb having the item id of 30, who knows what it will be used for.
After doing some more tests on this peculiar item, I figured out that it slows you down! I have no idea what his could be used for but it may have something to do with spiders. (I don't know if somebody has already made something about this, so tell me if there is)