The rivers of Elderslade are polluted, fouling the sparkling waters of the Dvergvát.
'Water is essential, and whoever controls the waterways will have an advantage in this war. Our forces also need clean water to drink, but the rivers have been fouled by filth that the Orcs have strewn about. Their waters flow into the Dvergvát, whose sapphire waters are famed among the dwarves.
'Find the piles the Orcs have left behind and burn them. The Dvergvát will return to its former glory and our troops may partake of its waters without harm.'
Piles of Orc-filth can be found along river-beds in Elderslade.
Mother Amma has tasked you with cleansing the rivers that flow into the Dvergvát.
Mother Amma is in Annâk-khurfu, in eastern Elderslade.
You should talk to Mother Amma.