The Silmarillion

Meanwhile Morgoth escaping from the pursuit of the Valar came to the wastes of Araman. This land lay northward between the Mountains of the Pelóri and the Great Sea, as Avathar lay to the south; but Araman was a wider land, and between the shores and the mountains were barren plains, ever colder as the Ice drew nearer. Through this region Morgoth and Ungoliant passed in haste, and so came through the great mists of Oiomúrë to the Helcaraxë, where the strait between Araman and Middle-earth was filled with grinding ice; and he crossed over, and came back at last to the north of the Outer Lands. Together they went on, for Morgoth could not elude Ungoliant, and her cloud was still about him, and all her eyes were upon him; and they came to those lands that lay north of the Firth of Drengist. Now Morgoth was drawing near to the ruins of Angband, where his great western stronghold had been; and Ungoliant perceived his hope, and knew that here he would seek to escape from her, and she stayed him, demanding that he fulfil his promise.

'Blackheart!' she said. 'I have done thy bidding. But I hunger still.'

'What wouldst thou have more?' said Morgoth. 'Dost thou desire all the world for thy belly? I did not vow to give thee that. I am its Lord.'

'Not so much,' said Ungoliant. 'But thou hast a great treasure from Formenos; I will have all that. Yea, with both hands thou shalt give it'.

Then perforce Morgoth surrendered to her the gems that he bore with him, one by one and grudgingly; and she devoured them, and their beauty perished from the world. Huger and darker yet grew Ungoliant, but her lust was unsated. 'With one hand thou givest,' she said; 'with the left only. Open thy right hand.'

In his right hand Morgoth held close the Silmarils, and though they were locked in a crystal casket, they had begun to bum him, and his hand was clenched in pain; but he would not open it 'Nay!' he said. 'Thou hast had thy doe. For with my power that I put into thee thy work was accomplished. I need thee no more. These things thou shalt not have, nor see. I name them unto myself for ever. '

But Ungoliant had grown great, and he less by the power that had gone out of him; and she rose against him, and her cloud closed about him, and she enmeshed him in a web of clinging thongs to strangle him. Then Morgoth sent forth a terrible cry, that echoed in the mountains. Therefore that region was called Lammoth; for the echoes of his voice dwelt there ever after, so that any who cried aloud in that land awoke them, and all the waste between the hills and the sea was filled with a clamour as of voices in anguish. The cry of Morgoth in that hour was the greatest and most dreadful that was ever heard in the northern world; the mountains shook, and the earth trembled, and rocks were riven asunder. Deep in forgotten places that cry was heard. Far beneath the ruined halls of Angband, in vaults to which the Valar in the haste of their assault had not descended, Balrogs lurked still, awaiting ever the return of their Lord; and now swiftly they arose, and passing over Hithlum they came to Lammoth as a tempest of fire. With their whips of flame they smote asunder the webs of Ungoliant, and she quailed, and turned to flight, belching black vapours to cover her; and fleeing from the north she went down into Beleriand, and dwelt beneath Ered Gorgoroth, in that dark valley that was after called Nan Dungortheb, the Valley of Dreadful Death, because of the horror that she bred there. For other foul creatures of spider form had dwelt there since the days of the delving of Angband, and she mated with them, and devoured them; and even after Ungoliant herself departed, and went whither she would into the forgotten south of the world, her offspring abode there and wove their hideous webs. Of the fate of Ungoliant no tale tells. Yet some have said that she ended long ago, when in her uttermost famine she devoured herself at last.