 Sauron was aware of her existence, but left her alone as a useful guard on the pass, and occasionally fed prisoners to her.In the story, Gollum led the Hobbits into her lair, planning to recover the One Ring once she had consumed the hobbits.She cornered them; but Frodo used the Phial of Galadriel's light to drive her off, and used Sting to cut the webs blocking the tunnel.