Return to Chillwind Camp:

Bring the Filled Felstone Field Bottle to High Priestess MacDonnell at Chillwind Camp, Western Plaguelands.

You fill the bottle with enough of the cauldron's poisonous concoction for a suitable sample to be studied.

With the poison in hand, it is time to return to High Priestess MacDonnell at Chillwind Camp to complete the mission.

High Priestess MacDonnell: Welcome back to the relative safety of Chillwind Camp, Trukaos. What progress on the cauldrons do you have to report?

High Priestess MacDonnell: Well done Trukaos - it should take Alchemist Arbington no time at all to analyze this and devise a counter agent to introduce into the cauldron. If we are able to pump out enough of it into the air, we might be able to weaken all the Scourge present here.

This will no doubt be an ongoing ordeal; we will need to continually hit these cauldrons and introduce our reagents into their mix. Still, if we can keep it up, we will have a huge advantage over Scourge when the time comes for battle!