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.$B$BDo not tarry, $N, for the venom sac must be fresh when you deliver it.