The Tolkien Monster Encyclopedia by Calle Mattsson This page is devoted to all the monsters and races belonging to darkness. Here you will find Orcs, Goblins, Balrogs and many more fearsome creatures.

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Silent Watchers ´´They were like great figures seated upon thrones. Each had three joined bodies, and three heads facing outward, and inward, and across the gateway. The heads had vulture-faces, and on their great knees were laid clawlike hands. They seemed to be carved out of huge blocks of stone, immovable, and yet they were aware: some dreadful spirit of evil vigilance abode in them. They knew an enemy.Visible or invisible none could pass unheeded.´ Sam Gamgee had to use the phial of Galadriel to gain entrance into Cirith Ungol where Frodo was held captive (LotR3).