Thurindol asks for you to taint the food supplies which the Orcs keep below the Slag-hills in order to sicken their numbers.
'As luck would have it, I was able to find a way to transport the corrosive goo of the maggots. By watering it down with some of the polluted waters of the Slag-hills, the concoction no longer erodes its container. I would say that it is no longer useful as a corrosive weapon against machines of war. It may be very useful as a poison though.
'Apply this concoction to the Orcs' food supplies. Let use see what happens.'
Maggot larvae can be found within the caverns of Skoironk.
You should taint the Orc food supplies in Skoironk.
You have tainted much of the Orc food supplies in Skoironk.