Lithrogath (S."Dust-Demons") were demons of ash and rock, spawned in the deep bowels of Thangorodrim as taskmasters for the slaves fueling the pits and fires of Morgoth's great war-machines. Although many were destroyed with the fall of Ancalagon,some survivors fled to the mountains and especially into Mordor where Orodruin and the ashen plain of Gorgoroth were located. It was here that they were found by Sauron and fell into his service performing the same duties they once held. With the overthrow of Sauron and fall of Barad-dur, they were finally free to do their own bidding.