Nithi wishes to sow confusion among the ranks of Sauron's forces so soldiers of the Great Alliance can carry out their attacks in the Shadowfells of Emyn Duir.
'If we are to press the attack upon the tower of Barad-dûr, we will need to have a distraction. Otherwise the attack will fail before it is barely begun! I have spent many years in the mines, and the darkness of the Shadowfells is not unlike the caverns with which I am familiar.
'What is the best way to distract the darkness, you ask? Why, with fire, of course! I ask you to light fires throughout Emyn Duir, for the sorcerous creatures of the Shadowfells will not be able to abide their light, and the flames will draw the attention of anyone hereabout.
'By Durin's beard, I am certain this plan will work! It just makes sense, my friend, does it not?'
Flammable debris can be found throughout Emyn Duir.
You should start fires and defeat enemies throughout Emyn Duir.
Nithi can be found at Barthost.
You should return to Nithi with news of your successes in Emyn Duir.