What is this Filth? - ESO

What is this Filth? icon
What is this Filth?

For every time that Noxious Sludge is cleansed, use all 4 cleansing pools to simultaneously remove it from 4 different infected party members, then defeat Oaxiltso in Veteran Rockgrove.

10
Name: What is this Filth?
Found in: Blackwood > Rockgrove
Achievement points: 10