I recommend the
Encyclopedia of Arda website because it has one of the most comprehensive listings about Middle-earth.
The Doom of Mandos, also called the Prophecy of the North, was the dreadful prophecy and curse uttered by Mandos to Fëanor and his followers as they marched to Middle-earth, against the will of the Valar. The prophecy part foretold that the Oath of Fëanor would cause only grief for him and his sons, and for all who came into contact with the Silmarilli. Mandos also cursed the House of Fëanor, calling them the Dispossessed, which meant that they could no longer lay claim to the High Kingship of the Noldor. That title was now given to the eldest of the House of Fingolfin. Even though this curse/prophecy was dreadful and frightening, only one small group of Elves turned back, Finarfin, the youngest son of Finwë, and his followers.
The rest under Fëanor kept on going, but eventually the curse caught up to them, causing the Kinslaying at Alqualondë and a number of other dastardly events.
<font size=1 color=339966>[ 6:18 PM December 11, 2003: Message edited by: Finwe ]