§ Of the Darkening of Valinor The Silmarillion

A cloak of darkness she wove about them when Melkor and Ungoliant set forth; an Unlight, in which things seemed to be no more, and which eyes could not pierce, for it was void. Then slowly she wrought her webs: rope by rope from cleft to cleft, from jutting rock to pinnacle of stone, ever climbing upwards, crawling and clinging, until at last she reached the very summit of Hyarmentir, the highest mountain in that region of the world, far south of great Taniquetil. There the Valar were not vigilant; for west of the Pelóri was an empty land in twilight, and eastward the mountains looked out, save for forgotten Avathar, only upon the dim waters of the pathless sea. But now upon the mountain-top dark Ungoliant lay; and she made a ladder of woven ropes and cast it down, and Melkor climbed upon it and came to that high place, and stood beside her, looking down upon the Guarded Realm. Below them lay the woods of Oromë, and westward shimmered the fields and pastures of Yavanna, gold beneath the tall wheat of the gods. Bat Melkor looked north, and saw afar the shining plain, and the silver domes of Valmar gleaming in the mingling of the lights of Telperion and Laurelin. Then Melkor laughed aloud, and leapt swiftly down the long western slopes; and Ungoliant was at his side, and her darkness covered them.