The Flight of the Noldor came about when the evil Vala (sing. form of Valar) Melkor (Morgoth) stole the Silmarils, the holy jewels that held the mingled light of Telperion and Laurelin. Melkor, accompained by the gigantic spider Ungoliant, also poisoned the two trees, killing them. Thus, the Noldor left Valinor, and upon their departure swore a terrible oath. Only until many centuries after Fingolfin and Feanor's deaths were the Silmarils taken again by an assault on Melkor by the Valar at his fortress in the north of Middle-earth. However, all three eventually came into their intended mediums; one in the bowels of the earth, one in the sea, and one in the sky, shining as a star.