Deadly Arachnid Mandibles?

[Baltazor]

Trying to finish the Human GM cultural armor quest and the last thing you need is "Deadly Arachnid Mandibles". Been killing tons of spiders in Lavastorm and Lavaspinner and haven't seen any yet. I have searched the forums and Allakhzams without any success. Am I just unlucky in the drops so far OR is their a special mission that they drop in?

[Abazagaroth]

Killing spiders in those zones do nothing for you. You must be in an instanced DoN dungeon with spiders.

[Baltazor]

Thanks but I already knew that ~ I was looking for the names of some specific missions.

[Starhanger]

I got mine in a mission called... Forbin's Elixer..

I am so glad to be finished for now..LOL

[Caprich]

I got mine in Lavaspinner Hunting.

[KyStromm]

Lavaspinners Locals has them, I've looted them
Infested (or Infestation) is supposed to be lousy with spiders, and should drop there, but I can not confirm it of my own knowledge