I must have a fresh sample of the venom you brought me. The spiders from which it was gathered must dwell in the Hinterlands -- hunt them until you find an undamaged venom sac and bring it to me. You will find many spiders near the troll city of Shadra'Alor.
Do not tarry, <name>, for the venom sac must be fresh when you deliver it.
Do you have the undamaged venom sac, <name>? I yearn to run experiments with its fresh venom, and have ordered a collection of small, terribly cute animals on which to test it!
Completion
Oh, splendid! The venom is quite fresh and I'm sure very deadly. Thank you!