** TTT - Shelob

'Galadriel!' he called, and gathering his courage he lifted up the Phial once more. The eyes halted. Then Frodo's heart flamed within him, and without thinking what he did, whether it was folly or despair or courage, he took the Phial in his left hand, and with his right hand drew his sword. Sting flashed out, and the sharp elven-bladed sparkled in the silver light, but at its edges a blue fire flickered. Then holding the star aloft and the bright sword advanced, Frodo, hobbit of the Shire, walked steadily down to meet the eyes....

Holding aloft the Phial Frodo looked and before him he saw a greyness which the radiance of the star-glass did not pierce and did not illuminate, as if it were a shadow that being cast by no light, no light could dissipate. Across the width and height of the tunnel a vast web was spun, orderly as the web of some huge spider, but denser-woven and far greater, and each thread was as thick as a rope...

Shortly afterwards, Frodo is stung, and when Sam finds him, he assumes he is dead. Before the Orcs find Frodo's limp body and reveals he isn't really dead, Sam gets ahold of Sting and the One Ring.

--TTT, "Shelob's Lair" .