Some goblins of Isengard have been using a remote corner of Pren Gwydh to raise Wargs for steeds and are careless about keeping the dangerous beasts contained to their pens.
'I am not certain what the best course of action is here, ${PLAYER}. I am but a simple scout, not a Warg-slayer or goblin-butcher!
'If I were younger, perhaps I would make some effort to burn the Warg-pens within that horrifying camp. If you burn their pens while you kill Wargs and drive out goblins, perhaps they will not come back.
'It is unfortunate that I am not younger.'
Warg-pens can be found in the Howling Caverns.
You should burn the pens while fighting your way through the camp to ensure that the goblins leave and do not think to return.
Goronu can be found outside of the Howling Caverns.
You should tell Goronu that you have burned many Warg-pens to dissuade the goblins from rebuilding here.